1 files changed, 5 insertions, 5 deletions
diff --git a/userdiff.h b/userdiff.h
index f5cb53d0d4..7565930337 100644
--- a/userdiff.h
+++ b/userdiff.h
@@ -7,7 +7,7 @@ struct index_state;
 struct repository;
 
 struct userdiff_funcname {
-	char *pattern;
+	const char *pattern;
 	int cflags;
 };
 
@@ -19,12 +19,12 @@ struct external_diff {
 struct userdiff_driver {
 	const char *name;
 	struct external_diff external;
-	char *algorithm;
+	const char *algorithm;
 	int binary;
 	struct userdiff_funcname funcname;
-	char *word_regex;
-	char *word_regex_multi_byte;
-	char *textconv;
+	const char *word_regex;
+	const char *word_regex_multi_byte;
+	const char *textconv;
 	struct notes_cache *textconv_cache;
 	int textconv_want_cache;
 };