diff --git a/test/CFrontend/2006-03-17-KnRMismatch.c b/test/CFrontend/2006-03-17-KnRMismatch.c
new file mode 100644
index 00000000000..19391122fca
--- /dev/null
+++ b/test/CFrontend/2006-03-17-KnRMismatch.c
@@ -0,0 +1,8 @@
+// RUN: %llvmgcc %s -S -o -
+
+void regnode(int op);
+
+void regnode(op)
+char op;
+{
+}