diff --git a/src/V3Split.cpp b/src/V3Split.cpp
index ef7d848c5..f7eedfee3 100644
--- a/src/V3Split.cpp
+++ b/src/V3Split.cpp
@@ -457,7 +457,7 @@ public:
 
     // METHODS
 protected:
-    void makeRvalueEdges(SplitVarStdVertex* vstdp) {
+    virtual void makeRvalueEdges(SplitVarStdVertex* vstdp) VL_OVERRIDE {
         for (VStack::iterator it = m_stmtStackps.begin(); it != m_stmtStackps.end(); ++it) {
             new SplitRVEdge(&m_graph, *it, vstdp);
         }
@@ -876,7 +876,7 @@ public:
 
     // METHODS
 protected:
-    void makeRvalueEdges(SplitVarStdVertex* vstdp) {
+    virtual void makeRvalueEdges(SplitVarStdVertex* vstdp) VL_OVERRIDE {
         // Each 'if' depends on rvalues in its own conditional ONLY,
         // not rvalues in the if/else bodies.
         for (VStack::const_iterator it = m_stmtStackps.begin(); it != m_stmtStackps.end(); ++it) {
diff --git a/src/astgen b/src/astgen
index fcf7f718f..d5f6af222 100644
--- a/src/astgen
+++ b/src/astgen
@@ -627,7 +627,7 @@ sub tree_base {
         # saves one comparison.
         if ($out_for_type_sc[0]) {      # Short-circuited types
             $self->print("    // Generated by astgen with short-circuiting\n",
-                         "    virtual void visit(Ast${type}* nodep) {\n",
+                         "    virtual void visit(Ast${type}* nodep) VL_OVERRIDE {\n",
                          "      iterateAndNextNull(nodep->lhsp());\n",
                          @out_for_type_sc);
             $self->print("      iterateAndNextNull(nodep->rhsp());\n",
@@ -638,8 +638,9 @@ sub tree_base {
         } elsif ($out_for_type[0]) {    # Other types with something to print
             my $skip = $self->{tree_skip_visit}{$type};
             my $gen = $skip ? "Gen" : "";
+            my $override = $skip ? "" : " VL_OVERRIDE";
             $self->print("    // Generated by astgen\n",
-                         "    virtual void visit$gen(Ast${type}* nodep) {\n",
+                         "    virtual void visit$gen(Ast${type}* nodep)${override} {\n",
                          ($skip?"":
                           "        iterateChildren(nodep);\n"),
                          @out_for_type,