diff --git a/test/Bindings/llvm-c/echo.ll b/test/Bindings/llvm-c/echo.ll
index f4ba60eb619..30e7f4facfa 100644
--- a/test/Bindings/llvm-c/echo.ll
+++ b/test/Bindings/llvm-c/echo.ll
@@ -1,6 +1,6 @@
 ; RUN: llvm-as < %s | llvm-dis > %t.orig
 ; RUN: llvm-as < %s | llvm-c-test --echo > %t.echo
-; RUN: diff %t.orig %t.echo
+; RUN: diff -w %t.orig %t.echo
 
 declare void @decl()