diff --git a/src/V3Ast.h b/src/V3Ast.h
index 80bc45de5..8a77d6450 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -254,7 +254,9 @@ public:
 	// Internal types for mid-steps
 	SCOPEPTR, CHARPTR,
 	// Internal types, eliminated after parsing
-	LOGIC_IMPLICIT
+	LOGIC_IMPLICIT,
+	// Leave last
+	_ENUM_MAX
     };
     enum en m_e;
     const char* ascii() const {
@@ -264,7 +266,8 @@ public:
 	    "real", "shortint", "shortreal", "time",
 	    "string",
 	    "VerilatedScope*", "char*",
-	    "LOGIC_IMPLICIT"
+	    "LOGIC_IMPLICIT",
+	    " MAX"
 	};
 	return names[m_e];
     };
@@ -275,10 +278,15 @@ public:
 	    "double", "short int", "float", "long long",
 	    "const char*",
 	    "dpiScope", "const char*",
-	    ""
+	    "",
+	    " MAX"
 	};
 	return names[m_e];
     };
+    static void test() {
+	UASSERT(0==strcmp(AstBasicDTypeKwd(_ENUM_MAX).ascii()," MAX"),"Enum array mismatch");
+	UASSERT(0==strcmp(AstBasicDTypeKwd(_ENUM_MAX).dpiType()," MAX"),"Enum array mismatch");
+    }
     inline AstBasicDTypeKwd () : m_e(UNKNOWN) {}
     inline AstBasicDTypeKwd (en _e) : m_e(_e) {}
     explicit inline AstBasicDTypeKwd (int _e) : m_e(static_cast<en>(_e)) {}
@@ -868,7 +876,6 @@ public:
     void	numericFrom(AstNode* fromp) { numeric(fromp->numeric()); }
     void	numeric(AstNumeric flag) { m_numeric = (int)flag; if (flag.isDouble()) width(64,64); }
     AstNumeric	numeric() const { return AstNumeric(m_numeric); }
-    void	isSigned(bool flag) { numeric(flag ? AstNumeric::SIGNED : AstNumeric::UNSIGNED); }
     bool	isUnsigned() const { return numeric().isUnsigned(); }
     void	didWidth(bool flag) { m_didWidth=flag; }
     bool	didWidth() const { return m_didWidth; }
@@ -942,6 +949,7 @@ public:
     bool	isAllOnesV();  // Verilog width rules apply
 
     // METHODS - data type changes especially for initial creation
+    void	dtypeChgSigned(bool flag) { numeric(flag ? AstNumeric::SIGNED : AstNumeric::UNSIGNED); }
     void	dtypeSetBitSized(int widthf, int widthMinf, AstNumeric numericf) { numeric(numericf); width(widthf,widthMinf); }
     void	dtypeSetLogicSized(int widthf, int widthMinf, AstNumeric numericf) { numeric(numericf); width(widthf,widthMinf); }
     void	dtypeSetLogicBool()	{ numeric(AstNumeric::UNSIGNED); width(1,1); }
diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index c5b4f82c9..11a600966 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -527,7 +527,7 @@ private:
     virtual void visit(AstConst* nodep, AstNUser* vup) {
 	// The node got setup with the signed/real state of the node.
 	// However a later operation may have changed the node->signed w/o changing
-	// the number's sign.  So we don't: nodep->isSigned(nodep->num().isSigned());
+	// the number's sign.  So we don't: nodep->dtypeChgSigned(nodep->num().isSigned());
 	if (vup && vup->c()->prelim()) {
 	    if (nodep->num().sized()) {
 		nodep->width(nodep->num().width(), nodep->num().width());
@@ -575,7 +575,7 @@ private:
 	    replaceWithDVersion(nodep); nodep=NULL;
 	} else {
 	    AstNodeBiop* newp = shift_final(nodep, vup);  nodep=NULL;
-	    newp->isSigned(newp->lhsp()->isSigned());
+	    newp->dtypeChgSigned(newp->lhsp()->isSigned());
 	    if (newp->isSigned()) {
 		replaceWithUOrSVersion(newp, false);  newp=NULL;
 	    }
@@ -585,7 +585,7 @@ private:
 	// Pow is special, output sign only depends on LHS sign
 	shift_prelim(nodep, vup);
 	AstNodeBiop* newp = shift_final(nodep, vup);  nodep=NULL;
-	newp->isSigned(newp->lhsp()->isSigned());
+	newp->dtypeChgSigned(newp->lhsp()->isSigned());
 	if (!newp->isSigned()) {
 	    replaceWithUOrSVersion(newp, true);  newp=NULL;
 	}
@@ -1448,7 +1448,7 @@ private:
 		nodep = newp;  // Process new node instead
 	    }
 	} else {
-	    nodep->isSigned(nodep->lhsp()->isSigned());
+	    nodep->dtypeChgSigned(nodep->lhsp()->isSigned());
 	    // Note there aren't yet uniops that need version changes
 	    // So no need to call replaceWithUOrSVersion(nodep, nodep->isSigned())
 	}
@@ -1486,7 +1486,7 @@ private:
 	// Widths: Output width from lhs, rhs<33 bits
 	// Signed: Output signed iff LHS signed; unary operator
 	shift_prelim(nodep,vup);
-	nodep->isSigned(nodep->lhsp()->isSigned());
+	nodep->dtypeChgSigned(nodep->lhsp()->isSigned());
 	AstNodeBiop* newp = shift_final(nodep,vup); nodep=NULL;
 	if (newp) {}  // Ununused
     }
@@ -1538,7 +1538,7 @@ private:
 	int width  = max(vup->c()->width(),    max(nodep->lhsp()->width(),    nodep->rhsp()->width()));
 	int mwidth = max(vup->c()->widthMin(), max(nodep->lhsp()->widthMin(), nodep->rhsp()->widthMin()));
 	nodep->width(width,mwidth);
-	nodep->isSigned(nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned());
+	nodep->dtypeChgSigned(nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned());
 	if (vup->c()->final()) {
 	    // Final call, so make sure children check their sizes
 	    nodep->lhsp()->iterateAndNext(*this,WidthVP(width,mwidth,FINAL).p());
@@ -1584,7 +1584,7 @@ private:
 		nodep = newp;  // Process new node instead
 	    }
 	} else {
-	    nodep->isSigned(nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned());
+	    nodep->dtypeChgSigned(nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned());
 	    if (AstNodeBiop* newp=replaceWithUOrSVersion(nodep, nodep->isSigned())) { nodep=NULL;
 		nodep = newp;  // Process new node instead
 	    }
@@ -1858,11 +1858,11 @@ private:
 	}
 	// To simplify callers, some node types don't need to change
 	switch (nodep->type()) {
-	case AstType::atEQ:	nodep->isSigned(signedFlavorNeeded); return NULL;
-	case AstType::atNEQ:	nodep->isSigned(signedFlavorNeeded); return NULL;
-	case AstType::atADD:	nodep->isSigned(signedFlavorNeeded); return NULL;
-	case AstType::atSUB:	nodep->isSigned(signedFlavorNeeded); return NULL;
-	case AstType::atSHIFTL:	nodep->isSigned(signedFlavorNeeded); return NULL;
+	case AstType::atEQ:	nodep->dtypeChgSigned(signedFlavorNeeded); return NULL;
+	case AstType::atNEQ:	nodep->dtypeChgSigned(signedFlavorNeeded); return NULL;
+	case AstType::atADD:	nodep->dtypeChgSigned(signedFlavorNeeded); return NULL;
+	case AstType::atSUB:	nodep->dtypeChgSigned(signedFlavorNeeded); return NULL;
+	case AstType::atSHIFTL:	nodep->dtypeChgSigned(signedFlavorNeeded); return NULL;
 	default: break;
 	}
 	FileLine* fl = nodep->fileline();
diff --git a/src/Verilator.cpp b/src/Verilator.cpp
index 53d429ea3..b13e28f81 100644
--- a/src/Verilator.cpp
+++ b/src/Verilator.cpp
@@ -656,6 +656,7 @@ int main(int argc, char** argv, char** env) {
     }
 
     // Internal tests (after option parsing as need debug() setting)
+    AstBasicDTypeKwd::test();
     V3Graph::test();
 
     //--FRONTEND------------------