diff --git a/src/V3Clean.cpp b/src/V3Clean.cpp
index 2e8636b9e..bfa0b0564 100644
--- a/src/V3Clean.cpp
+++ b/src/V3Clean.cpp
@@ -273,6 +273,7 @@ private:
     virtual void visit(AstCCall* nodep, AstNUser*) {
 	nodep->iterateChildren(*this);
 	insureCleanAndNext (nodep->argsp());
+	setClean (nodep, true);
     }
 
     //--------------------