diff --git a/test/CFrontend/2007-08-21-ComplexCst.c b/test/CFrontend/2007-08-21-ComplexCst.c
new file mode 100644
index 00000000000..7ddd87c08e4
--- /dev/null
+++ b/test/CFrontend/2007-08-21-ComplexCst.c
@@ -0,0 +1,3 @@
+// RUN: %llvmgcc -O2 -c %s -o /dev/null
+void f(_Complex float z);
+void g() { f(1.0i); }