diff --git a/src/transform/AstDumpDotPass.cpp b/src/transform/AstDumpDotPass.cpp
index 420bdb69..39792648 100644
--- a/src/transform/AstDumpDotPass.cpp
+++ b/src/transform/AstDumpDotPass.cpp
@@ -127,6 +127,7 @@ class AstDumpDotVisitor final : public RecursiveVisitor
     void visit( ImportDefinition& node ) override;
     void visit( StructureDefinition& node ) override;
     void visit( FeatureDefinition& node ) override;
+    void visit( ImplementationDefinition& node ) override;
 
     void visit( ValueLiteral& node ) override;
     void visit( ReferenceLiteral& node ) override;
@@ -343,6 +344,13 @@ void AstDumpDotVisitor::visit( FeatureDefinition& node )
     RecursiveVisitor::visit( node );
 }
 
+void AstDumpDotVisitor::visit( ImplementationDefinition& node )
+{
+    DotLink link( this, &node );
+    dumpNode( node, "ImplementationDefinition" );
+    RecursiveVisitor::visit( node );
+}
+
 void AstDumpDotVisitor::visit( UndefLiteral& node )
 {
     DotLink link( this, &node );