diff --git a/man-db-2.6.3-zio.dif b/man-db-2.6.3-zio.dif
index f2e9058..2bf818c 100644
--- a/man-db-2.6.3-zio.dif
+++ b/man-db-2.6.3-zio.dif
@@ -125,21 +125,21 @@
 +#ifdef HAVE_ZIO
 +	ext = strrchr (filename, '.');
 +	if (ext) {
-+		char opt[2] = {'\0', '\0'};
++		const char *opt;
 +		char *name;
 +
 +		if (STREQ (ext, ".gz"))
-+			*opt = 'g';
++			opt = "g";
 +		else if (STREQ (ext, ".z"))
-+			*opt = 'z';
++			opt = "z";
 +		else if (STREQ (ext, ".bz2"))
-+			*opt = 'b';
++			opt = "b";
 +		else if (STREQ (ext, ".xz"))
-+			*opt = 'x';
++			opt = "x";
 +		else if (STREQ (ext, ".lzma"))
-+			*opt = 'l';
++			opt = "l";
 +		else if (STREQ (ext, ".Z"))
-+			*opt = 'Z';
++			opt = "Z";
 +		else
 +			goto nozio;
 +