diff --git a/net_expr.cc b/net_expr.cc
index 4a0ee3008..5cd29e013 100644
--- a/net_expr.cc
+++ b/net_expr.cc
@@ -304,7 +304,7 @@ ivl_variable_type_t NetECReal::expr_type() const
       return IVL_VT_REAL;
 }
 
-NetECRealParam::NetECRealParam(NetScope*s, perm_string n, const verireal&v)
+NetECRealParam::NetECRealParam(const NetScope*s, perm_string n, const verireal&v)
 : NetECReal(v), scope_(s), name_(n)
 {
 }
diff --git a/netlist.cc b/netlist.cc
index a83b5f5e3..21a44faea 100644
--- a/netlist.cc
+++ b/netlist.cc
@@ -2391,7 +2391,7 @@ void NetEConst::trim()
       expr_width(value_.len());
 }
 
-NetEConstParam::NetEConstParam(NetScope*s, perm_string n, const verinum&v)
+NetEConstParam::NetEConstParam(const NetScope*s, perm_string n, const verinum&v)
 : NetEConst(v), scope_(s), name_(n)
 {
       cast_signed_base_(v.has_sign());
diff --git a/netlist.h b/netlist.h
index 68514c3e6..dd6b9dbb7 100644
--- a/netlist.h
+++ b/netlist.h
@@ -2175,7 +2175,7 @@ class NetEConstEnum  : public NetEConst {
 class NetEConstParam  : public NetEConst {
 
     public:
-      explicit NetEConstParam(NetScope*scope, perm_string name,
+      explicit NetEConstParam(const NetScope*scope, perm_string name,
 			      const verinum&val);
       ~NetEConstParam();
 
@@ -2188,7 +2188,7 @@ class NetEConstParam  : public NetEConst {
       virtual NetEConstParam* dup_expr() const;
 
     private:
-      NetScope*scope_;
+      const NetScope*scope_;
       perm_string name_;
 };
 
@@ -2236,7 +2236,7 @@ class NetECString  : public NetEConst {
 class NetECRealParam  : public NetECReal {
 
     public:
-      explicit NetECRealParam(NetScope*scope, perm_string name,
+      explicit NetECRealParam(const NetScope*scope, perm_string name,
 			      const verireal&val);
       ~NetECRealParam();
 
@@ -2249,7 +2249,7 @@ class NetECRealParam  : public NetECReal {
       virtual NetECRealParam* dup_expr() const;
 
     private:
-      NetScope*scope_;
+      const NetScope*scope_;
       perm_string name_;
 };