diff --git a/clang/unittests/AST/OMPStructuredBlockTest.cpp b/clang/unittests/AST/OMPStructuredBlockTest.cpp
--- a/clang/unittests/AST/OMPStructuredBlockTest.cpp
+++ b/clang/unittests/AST/OMPStructuredBlockTest.cpp
@@ -55,7 +55,7 @@
                       StringRef ExpectedPrinted,
                       PolicyAdjusterType PolicyAdjuster = None) {
   std::vector<std::string> Args = {
-      "-fopenmp",
+      "-fopenmp=libomp",
   };
   return PrintedStmtMatches(Code, Args, NodeMatch, ExpectedPrinted,
                             PolicyAdjuster);