diff --git a/archive.c b/archive.c
index 99fadc88d..346f3b2f1 100644
--- a/archive.c
+++ b/archive.c
@@ -440,7 +440,7 @@ static int match_extension(const char *filename, const char *ext)
 	 * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 	 * filename).
 	 */
-	if (prefixlen < 2 || filename[prefixlen-1] != '.')
+	if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 		return 0;
 	return !strcmp(filename + prefixlen, ext);
 }