1 files changed, 1 insertions, 1 deletions
diff --git a/buf.h b/buf.h
index c275f9c..59c521b 100644
--- a/buf.h
+++ b/buf.h
@@ -12,7 +12,7 @@ void buf_init(buf_t *, size_t);
 void buf_grow(buf_t *, size_t);
 void buf_free(buf_t *);
 
-void buf_cat(buf_t *b, char *src, size_t n);
+void buf_cat(buf_t *b, const char *src, size_t n);
 void buf_catc(buf_t *b, char c);
 
 #endif