diff --git a/clang/lib/AST/OpenMPClause.cpp b/clang/lib/AST/OpenMPClause.cpp
index a2933d9..bd98728 100644
--- a/clang/lib/AST/OpenMPClause.cpp
+++ b/clang/lib/AST/OpenMPClause.cpp
@@ -1831,9 +1831,11 @@
   OS << "defaultmap(";
   OS << getOpenMPSimpleClauseTypeName(OMPC_defaultmap,
                                       Node->getDefaultmapModifier());
-  OS << ": ";
-  OS << getOpenMPSimpleClauseTypeName(OMPC_defaultmap,
-    Node->getDefaultmapKind());
+  if (Node->getDefaultmapKind() != OMPC_DEFAULTMAP_unknown) {
+    OS << ": ";
+    OS << getOpenMPSimpleClauseTypeName(OMPC_defaultmap,
+                                        Node->getDefaultmapKind());
+  }
   OS << ")";
 }