--- a/tests/no-config/test.list.exp
+++ b/tests/no-config/test.list.exp
@@ -1,5 +1,4 @@
  * gcc-config: No gcc profile is active!
-
 Using gcc-config info in @ROOT@/
 @GCC_CONFIG@: @ROOT@/etc/env.d/gcc/config-x86_64-pc-linux-gnu: No such file or directory
  [1] x86_64-pc-linux-gnu-4.6.2
--- a/tests/run_tests
+++ b/tests/run_tests
@@ -43,7 +43,7 @@ cmp_log() {
 	args+=( -e "s|: line [0-9]*: |: |g" )
 	sed "${args[@]}" "${exp}" > "${exp}.tmp"
 	sed "${args[@]}" "${log}" > "${log}.tmp"
-	diff -u "${exp}.tmp" "${log}.tmp" > "${log}.diff"
+	diff -uw "${exp}.tmp" "${log}.tmp" > "${log}.diff"
 	ret=$?
 	rm "${exp}.tmp"
 	return ${ret}