diff --git a/grep.c b/grep.c
index 8204ca25e5..2a3fe7ce6f 100644
--- a/grep.c
+++ b/grep.c
@@ -1215,12 +1215,12 @@ int grep_source(struct grep_opt *opt, struct grep_source *gs)
 	return grep_source_1(opt, gs, 0);
 }
 
-int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size)
+int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
 {
 	struct grep_source gs;
 	int r;
 
-	grep_source_init(&gs, GREP_SOURCE_BUF, name, NULL);
+	grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL);
 	gs.buf = buf;
 	gs.size = size;
 
diff --git a/grep.h b/grep.h
index e386ca4c73..8bf3001417 100644
--- a/grep.h
+++ b/grep.h
@@ -127,7 +127,7 @@ extern void append_grep_pattern(struct grep_opt *opt, const char *pat, const cha
 extern void append_header_grep_pattern(struct grep_opt *, enum grep_header_field, const char *);
 extern void compile_grep_patterns(struct grep_opt *opt);
 extern void free_grep_patterns(struct grep_opt *opt);
-extern int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size);
+extern int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size);
 
 struct grep_source {
 	char *name;
diff --git a/revision.c b/revision.c
index 064e351084..89d3a8fafb 100644
--- a/revision.c
+++ b/revision.c
@@ -2128,7 +2128,6 @@ static int commit_match(struct commit *commit, struct rev_info *opt)
 	if (!opt->grep_filter.pattern_list && !opt->grep_filter.header_list)
 		return 1;
 	return grep_buffer(&opt->grep_filter,
-			   NULL, /* we say nothing, not even filename */
 			   commit->buffer, strlen(commit->buffer));
 }