diff --git a/test/Transforms/InstCombine/shift.ll b/test/Transforms/InstCombine/shift.ll
index 4db7db977ec..9756880bcc3 100644
--- a/test/Transforms/InstCombine/shift.ll
+++ b/test/Transforms/InstCombine/shift.ll
@@ -1,6 +1,7 @@
 ; This test makes sure that these instructions are properly eliminated.
 ;
 
+; RUN: llvm-as < %s | opt -instcombine -disable-output &&
 ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep sh
 
 implementation
diff --git a/test/Transforms/InstCombine/xor.ll b/test/Transforms/InstCombine/xor.ll
index 57ba596421c..13199de8bd8 100644
--- a/test/Transforms/InstCombine/xor.ll
+++ b/test/Transforms/InstCombine/xor.ll
@@ -1,6 +1,7 @@
 ; This test makes sure that these instructions are properly eliminated.
 ;
 
+; RUN: llvm-as < %s | opt -instcombine -disable-output &&
 ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep 'xor '
 
 %G1 = global uint 0