diff --git a/clang/test/Preprocessor/pragma_unknown.c b/clang/test/Preprocessor/pragma_unknown.c
new file mode 100644
index 000000000000..ca2bea10e19c
--- /dev/null
+++ b/clang/test/Preprocessor/pragma_unknown.c
@@ -0,0 +1,6 @@
+// RUN: clang -E %s | grep '#pragma foo bar'
+
+// GCC doesn't expand macro args for unrecognized pragmas.
+#define bar xX
+#pragma foo bar
+