diff --git a/test/MC/COFF/align-nops.s b/test/MC/COFF/align-nops.s
index 8d9f8a51454..0824e2378a0 100644
--- a/test/MC/COFF/align-nops.s
+++ b/test/MC/COFF/align-nops.s
@@ -1,6 +1,5 @@
-// RUN: llvm-mc -filetype=obj -triple i686-pc-win32 %s -o %t
-// RUN: coff-dump.py %abs_tmp | FileCheck %s
-        
+// RUN: llvm-mc -filetype=obj -triple i686-pc-win32 %s -o - | coff-dump.py | FileCheck %s
+
 // Test that we get optimal nops in text
     .text
 f0:
diff --git a/test/MC/COFF/basic-coff.ll b/test/MC/COFF/basic-coff.ll
index 1452934c5da..29e02f0e0b1 100644
--- a/test/MC/COFF/basic-coff.ll
+++ b/test/MC/COFF/basic-coff.ll
@@ -1,8 +1,7 @@
 ; This test checks that the COFF object emitter works for the most basic
 ; programs.
 
-; RUN: llc -filetype=obj -mtriple i686-pc-win32 %s -o %t
-; RUN: coff-dump.py %abs_tmp | FileCheck %s
+; RUN: llc -filetype=obj -mtriple i686-pc-win32 %s -o - | coff-dump.py | FileCheck %s
 ; RUN: llc -filetype=obj -mtriple x86_64-pc-win32 %s -o %t
 
 @.str = private constant [12 x i8] c"Hello World\00" ; <[12 x i8]*> [#uses=1]
diff --git a/test/MC/COFF/symbol-fragment-offset.ll b/test/MC/COFF/symbol-fragment-offset.ll
index 6ea424f00c9..1f76e312e11 100644
--- a/test/MC/COFF/symbol-fragment-offset.ll
+++ b/test/MC/COFF/symbol-fragment-offset.ll
@@ -1,8 +1,7 @@
 ; The purpose of this test is to see if the COFF object writer is emitting the
 ; proper relocations for multiple pieces of data in a single data fragment.
 
-; RUN: llc -filetype=obj -mtriple i686-pc-win32 %s -o %t
-; RUN: coff-dump.py %abs_tmp | FileCheck %s
+; RUN: llc -filetype=obj -mtriple i686-pc-win32 %s -o - | coff-dump.py | FileCheck %s
 ; RUN: llc -filetype=obj -mtriple x86_64-pc-win32 %s -o %t
 
 @.str = private constant [7 x i8] c"Hello \00"    ; <[7 x i8]*> [#uses=1]