diff --git a/fips/fips_check_sha1 b/fips/fips_check_sha1
index c7d3ee14a..481bb8410 100755
--- a/fips/fips_check_sha1
+++ b/fips/fips_check_sha1
@@ -3,5 +3,5 @@
 FP=$1
 shift
 
-$TOP/fips/sha1/fips_standalone_sha1 $@ | diff $FP -
+$TOP/fips/sha1/fips_standalone_sha1 $@ | diff -u $FP -