diff --git a/vcs-svn/fast_export.c b/vcs-svn/fast_export.c
index 854b328d43..1f04697866 100644
--- a/vcs-svn/fast_export.c
+++ b/vcs-svn/fast_export.c
@@ -254,7 +254,7 @@ static int parse_ls_response(const char *response, uint32_t *mode,
 	}
 
 	/* Mode. */
-	if (response_end - response < strlen("100644") ||
+	if (response_end - response < (signed) strlen("100644") ||
 	    response[strlen("100644")] != ' ')
 		die("invalid ls response: missing mode: %s", response);
 	*mode = 0;
@@ -267,7 +267,7 @@ static int parse_ls_response(const char *response, uint32_t *mode,
 	}
 
 	/* ' blob ' or ' tree ' */
-	if (response_end - response < strlen(" blob ") ||
+	if (response_end - response < (signed) strlen(" blob ") ||
 	    (response[1] != 'b' && response[1] != 't'))
 		die("unexpected ls response: not a tree or blob: %s", response);
 	response += strlen(" blob ");