diff --git a/llvm/test/MC/COFF/bigobj.py b/llvm/test/MC/COFF/bigobj.py
--- a/llvm/test/MC/COFF/bigobj.py
+++ b/llvm/test/MC/COFF/bigobj.py
@@ -1,4 +1,4 @@
-# RUN: python %s | llvm-mc -filetype=obj -triple i686-pc-win32 - | llvm-readobj -h | FileCheck %s
+# RUN: python %s | llvm-mc -filetype=obj -triple i686-pc-win32 - | llvm-readobj -h - | FileCheck %s
 
 from __future__ import print_function
 
@@ -15,6 +15,7 @@
 # CHECK-NEXT:   TimeDateStamp: {{[0-9]+}}
 # CHECK-NEXT:   PointerToSymbolTable: 0x{{[0-9A-F]+}}
 # CHECK-NEXT:   SymbolCount: 195837
+# CHECK-NEXT:   StringTableSize: {{[0-9]+}}
 # CHECK-NEXT:   OptionalHeaderSize: 0
 # CHECK-NEXT:   Characteristics [ (0x0)
 # CHECK-NEXT:   ]
diff --git a/llvm/test/MC/COFF/lit.local.cfg b/llvm/test/MC/COFF/lit.local.cfg
--- a/llvm/test/MC/COFF/lit.local.cfg
+++ b/llvm/test/MC/COFF/lit.local.cfg
@@ -1,2 +1,4 @@
 if not 'X86' in config.root.targets:
     config.unsupported = True
+
+config.suffixes.add('.py')