diff --git a/vhdlpp/expression.h b/vhdlpp/expression.h
index c93e600ad..10cfcfb31 100644
--- a/vhdlpp/expression.h
+++ b/vhdlpp/expression.h
@@ -292,7 +292,7 @@ class ExpAggregate : public Expression {
 	    }
 
 # if __cplusplus >= 201103L
-	    constexpr choice_element& operator = (const choice_element&that) = default;
+	    choice_element& operator = (const choice_element&that) = default;
 # endif
 
 	    choice_t*choice;
diff --git a/vvp/vpi_priv.h b/vvp/vpi_priv.h
index 96e201a18..1d9bccfce 100644
--- a/vvp/vpi_priv.h
+++ b/vvp/vpi_priv.h
@@ -161,7 +161,7 @@ class __vpiDecConst : public __vpiHandle {
       explicit __vpiDecConst(int val =0);
       __vpiDecConst(const __vpiDecConst&that);
 # if __cplusplus >= 201103L
-      constexpr __vpiDecConst& operator = (const __vpiDecConst&that) = default;
+      __vpiDecConst& operator = (const __vpiDecConst&that) = default;
 # endif
       int get_type_code(void) const;
       int vpi_get(int code);