diff --git a/src/V3Ast.h b/src/V3Ast.h
index 14ba42da5..207b3e11e 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -544,9 +544,12 @@ public:
         static const char* const names[] = {
             "FALSE", "TRUE", "UNK"};
         return names[m_e]; }
-    bool trueU() const { return m_e == BU_TRUE || m_e == BU_UNKNOWN; }
-    bool falseU() const { return m_e == BU_FALSE || m_e == BU_UNKNOWN; }
+    bool trueKnown() const { return m_e == BU_TRUE; }
+    bool trueUnknown() const { return m_e == BU_TRUE || m_e == BU_UNKNOWN; }
+    bool falseKnown() const { return m_e == BU_FALSE; }
+    bool falseUnknown() const { return m_e == BU_FALSE || m_e == BU_UNKNOWN; }
     bool unknown() const { return m_e == BU_UNKNOWN; }
+    void setTrueOrFalse(bool flag) { m_e = flag ? BU_TRUE : BU_FALSE; }
   };
   inline bool operator==(VBoolOrUnknown lhs, VBoolOrUnknown rhs) { return (lhs.m_e == rhs.m_e); }
   inline bool operator==(VBoolOrUnknown lhs, VBoolOrUnknown::en rhs) { return (lhs.m_e == rhs); }
diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index 8b2f93b3b..fa85dd516 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -1336,7 +1336,7 @@ void AstCFunc::dump(std::ostream& str) const {
     if (slow()) str<<" [SLOW]";
     if (pure()) str<<" [PURE]";
     if (isStatic().unknown()) str<<" [STATICU]";
-    else if (isStatic().trueU()) str<<" [STATIC]";
+    else if (isStatic().trueUnknown()) str<<" [STATIC]";
     if (dpiImport()) str<<" [DPII]";
     if (dpiExport()) str<<" [DPIX]";
     if (dpiExportWrapper()) str<<" [DPIXWR]";
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 37947da07..f8b74b796 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -6629,6 +6629,7 @@ private:
     string      m_rtnType;              // void, bool, or other return type
     string      m_argTypes;
     string      m_ifdef;                // #ifdef symbol around this function
+    VBoolOrUnknown m_isConst;           // Function is declared const (*this not changed)
     VBoolOrUnknown m_isStatic;          // Function is declared static (no this)
     bool        m_dontCombine:1;        // V3Combine shouldn't compare this func tree, it's special
     bool        m_skipDecl:1;           // Don't declare it
@@ -6636,6 +6637,7 @@ private:
     bool        m_formCallTree:1;       // Make a global function to call entire tree of functions
     bool        m_slow:1;               // Slow routine, called once or just at init time
     bool        m_funcPublic:1;         // From user public task/function
+    bool        m_isMethod:1;           // Is inside a class definition
     bool        m_isInline:1;           // Inline function
     bool        m_symProlog:1;          // Setup symbol table for later instructions
     bool        m_entryPoint:1;         // User may call into this top level function
@@ -6648,6 +6650,7 @@ public:
     AstCFunc(FileLine* fl, const string& name, AstScope* scopep, const string& rtnType="")
         : ASTGEN_SUPER(fl) {
         m_funcType = AstCFuncType::FT_NORMAL;
+        m_isConst = VBoolOrUnknown::BU_UNKNOWN;  // Unknown until analyzed
         m_isStatic = VBoolOrUnknown::BU_UNKNOWN;  // Unknown until see where thisp needed
         m_scopep = scopep;
         m_name = name;
@@ -6658,6 +6661,7 @@ public:
         m_formCallTree = false;
         m_slow = false;
         m_funcPublic = false;
+        m_isMethod = true;
         m_isInline = false;
         m_symProlog = false;
         m_entryPoint = false;
@@ -6683,8 +6687,11 @@ public:
     //
     virtual void name(const string& name) { m_name = name; }
     virtual int instrCount() const { return dpiImport() ? instrCountDpi() : 0; }
+    VBoolOrUnknown isConst() const { return m_isConst; }
+    void isConst(bool flag) { m_isConst.setTrueOrFalse(flag); }
+    void isConst(VBoolOrUnknown flag) { m_isConst = flag; }
     VBoolOrUnknown isStatic() const { return m_isStatic; }
-    void isStatic(bool flag) { m_isStatic = flag ? VBoolOrUnknown::BU_TRUE : VBoolOrUnknown::BU_FALSE; }
+    void isStatic(bool flag) { m_isStatic.setTrueOrFalse(flag); }
     void isStatic(VBoolOrUnknown flag) { m_isStatic = flag; }
     void cname(const string& name) { m_cname = name; }
     string cname() const { return m_cname; }
@@ -6710,6 +6717,8 @@ public:
     string ifdef() const { return m_ifdef; }
     void funcType(AstCFuncType flag) { m_funcType = flag; }
     AstCFuncType funcType() const { return m_funcType; }
+    bool isMethod() const { return m_isMethod; }
+    void isMethod(bool flag) { m_isMethod = flag; }
     bool isInline() const { return m_isInline; }
     void isInline(bool flag) { m_isInline = flag; }
     bool symProlog() const { return m_symProlog; }
diff --git a/src/V3Depth.cpp b/src/V3Depth.cpp
index 59fb8214a..e04a62393 100644
--- a/src/V3Depth.cpp
+++ b/src/V3Depth.cpp
@@ -138,7 +138,7 @@ private:
     // (Here instead of new visitor after V3Descope just to avoid another visitor)
     void needNonStaticFunc(AstNode* nodep) {
         UASSERT_OBJ(m_funcp, nodep, "Non-static accessor not under a function");
-        if (m_funcp->isStatic().trueU()) {
+        if (m_funcp->isStatic().trueUnknown()) {
             UINFO(5,"Mark non-public due to "<<nodep<<endl);
             m_funcp->isStatic(false);
         }
diff --git a/src/V3Descope.cpp b/src/V3Descope.cpp
index 5a1635586..f48a27ce5 100644
--- a/src/V3Descope.cpp
+++ b/src/V3Descope.cpp
@@ -273,7 +273,7 @@ private:
     virtual void visit(AstCFunc* nodep) VL_OVERRIDE {
         if (!nodep->user1()) {
             m_needThis = false;
-            m_allowThis = nodep->isStatic().falseU();  // Non-static or unknown if static
+            m_allowThis = nodep->isStatic().falseUnknown();  // Non-static or unknown if static
             iterateChildren(nodep);
             nodep->user1(true);
             if (m_needThis) nodep->isStatic(false);
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 4986c4a45..b05c781b0 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -155,13 +155,17 @@ public:
             return lhsp->name() < rhsp->name();
         }
     };
-    void emitIntFuncDecls(AstNodeModule* modp) {
+    void emitIntFuncDecls(AstNodeModule* modp, bool methodFuncs) {
         typedef std::vector<const AstCFunc*> FuncVec;
         FuncVec funcsp;
 
         for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
             if (const AstCFunc* funcp = VN_CAST(nodep, CFunc)) {
-                if (!funcp->skipDecl()) { funcsp.push_back(funcp); }
+                if (!funcp->skipDecl()
+                    && funcp->isMethod() == methodFuncs
+                    && !funcp->dpiImport()) {  // DPI is prototyped in __Dpi.h
+                    funcsp.push_back(funcp);
+                }
             }
         }
 
@@ -169,21 +173,20 @@ public:
 
         for (FuncVec::iterator it = funcsp.begin(); it != funcsp.end(); ++it) {
             const AstCFunc* funcp = *it;
-            if (!funcp->dpiImport()) {  // DPI is prototyped in __Dpi.h
-                ofp()->putsPrivate(funcp->declPrivate());
-                if (!funcp->ifdef().empty()) puts("#ifdef " + funcp->ifdef() + "\n");
-                if (funcp->isStatic().trueU()) puts("static ");
-                puts(funcp->rtnTypeVoid());
-                puts(" ");
-                puts(funcp->nameProtect());
-                puts("(" + cFuncArgs(funcp) + ")");
-                if (funcp->slow()) puts(" VL_ATTR_COLD");
-                puts(";\n");
-                if (!funcp->ifdef().empty()) puts("#endif  // " + funcp->ifdef() + "\n");
-            }
+            ofp()->putsPrivate(funcp->declPrivate());
+            if (!funcp->ifdef().empty()) puts("#ifdef " + funcp->ifdef() + "\n");
+            if (funcp->isStatic().trueUnknown()) puts("static ");
+            puts(funcp->rtnTypeVoid());
+            puts(" ");
+            puts(funcp->nameProtect());
+            puts("(" + cFuncArgs(funcp) + ")");
+            if (funcp->isConst().trueKnown()) puts(" const");
+            if (funcp->slow()) puts(" VL_ATTR_COLD");
+            puts(";\n");
+            if (!funcp->ifdef().empty()) puts("#endif  // " + funcp->ifdef() + "\n");
         }
 
-        if (modp->isTop() && v3Global.opt.mtasks()) {
+        if (methodFuncs && modp->isTop() && v3Global.opt.mtasks()) {
             // Emit the mtask func prototypes.
             AstExecGraph* execGraphp = v3Global.rootp()->execGraphp();
             UASSERT_OBJ(execGraphp, v3Global.rootp(), "Root should have an execGraphp");
@@ -1245,8 +1248,10 @@ class EmitCImp : EmitCStmts {
         if (nodep->ifdef()!="") puts("#ifdef "+nodep->ifdef()+"\n");
         if (nodep->isInline()) puts("VL_INLINE_OPT ");
         puts(nodep->rtnTypeVoid()); puts(" ");
-        puts(prefixNameProtect(m_modp) + "::" + nodep->nameProtect() + "(" + cFuncArgs(nodep)
-             + ") {\n");
+        if (nodep->isMethod()) puts(prefixNameProtect(m_modp) + "::");
+        puts(nodep->nameProtect() + "(" + cFuncArgs(nodep) + ")");
+        if (nodep->isConst().trueKnown()) puts(" const");
+        puts(" {\n");
 
         // "+" in the debug indicates a print from the model
         puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+  ");
@@ -2738,7 +2743,7 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
     ofp()->putsPrivate(false);  // public:
     puts("void "+protect("__Vconfigure")+"("+symClassName()+"* symsp, bool first);\n");
 
-    emitIntFuncDecls(modp);
+    emitIntFuncDecls(modp, true);
 
     if (v3Global.opt.trace()) {
         ofp()->putsPrivate(false);  // public:
@@ -2757,6 +2762,8 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
 
     puts("} VL_ATTR_ALIGNED(128);\n");
 
+    emitIntFuncDecls(modp, false);
+
     // Save/restore
     if (v3Global.opt.savable() && modp->isTop()) {
         puts("\n");