1 files changed, 1 insertions, 1 deletions
diff --git a/utf8.h b/utf8.h
index 9a16c8679d..b68efef6f4 100644
--- a/utf8.h
+++ b/utf8.h
@@ -7,7 +7,7 @@ typedef unsigned int ucs_char_t;  /* assuming 32bit int */
 
 size_t display_mode_esc_sequence_len(const char *s);
 int utf8_width(const char **start, size_t *remainder_p);
-int utf8_strnwidth(const char *string, int len, int skip_ansi);
+int utf8_strnwidth(const char *string, size_t len, int skip_ansi);
 int utf8_strwidth(const char *string);
 int is_utf8(const char *text);
 int is_encoding_utf8(const char *name);