diff --git a/.git-hooks/pre-commit b/.git-hooks/pre-commit
index f3ea7b093895..521ed202b9ac 100755
--- a/.git-hooks/pre-commit
+++ b/.git-hooks/pre-commit
@@ -48,7 +48,7 @@ sub check_whitespaces($)
             print STDERR "$filename:$lineno:$line\n";
         }
     }
-    open( FILES, "git-diff-index -p -M --cached $h |" ) ||  die "Cannot run git diff-index.";
+    open( FILES, "git diff-index -p -M --cached $h |" ) ||  die "Cannot run git diff-index.";
     while (<FILES>)
     {
         if (m|^diff --git a/(.*) b/\1$|)