diff --git a/test/Sema/vector-assign.c b/test/Sema/vector-assign.c
index 3c0cd90..5162e1a 100644
--- a/test/Sema/vector-assign.c
+++ b/test/Sema/vector-assign.c
@@ -1,4 +1,4 @@
-// RUN: clang-cc %s -verify -fsyntax-only
+// RUN: clang-cc %s -verify -fsyntax-only -Wvector-conversions
 typedef unsigned int v2u __attribute__ ((vector_size (8)));
 typedef signed int v2s __attribute__ ((vector_size (8)));
 typedef signed int v1s __attribute__ ((vector_size (4)));
diff --git a/test/Sema/vector-cast.c b/test/Sema/vector-cast.c
index 15f29b9..bd09e69 100644
--- a/test/Sema/vector-cast.c
+++ b/test/Sema/vector-cast.c
@@ -1,4 +1,4 @@
-// RUN: clang-cc -fsyntax-only %s -verify
+// RUN: clang-cc -fsyntax-only %s -verify -Wvector-conversions
 
 typedef long long t1 __attribute__ ((vector_size (8)));
 typedef char t2 __attribute__ ((vector_size (16)));
@@ -28,3 +28,11 @@
   char *r3 = (char *)v1; // -expected-error {{invalid conversion between vector\
  type 't1' and scalar type 'char *'}}
 }
+
+
+void f2(t2 X);
+
+void f3(t3 Y) {
+  f2(Y);  // expected-warning {{incompatible vector types passing 't3', expected 't2'}}
+}
+