2 files changed, 2 insertions, 2 deletions
diff --git a/src/buffer.c b/src/buffer.c
index 19ea677..efee41d 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -95,7 +95,7 @@ void cmark_strbuf_grow(cmark_strbuf *buf, bufsize_t target_size)
 	buf->ptr   = new_ptr;
 }
 
-size_t cmark_strbuf_len(const cmark_strbuf *buf)
+bufsize_t cmark_strbuf_len(const cmark_strbuf *buf)
 {
 	return buf->size;
 }
diff --git a/src/buffer.h b/src/buffer.h
index d125207..9c850e4 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -38,7 +38,7 @@ void cmark_strbuf_grow(cmark_strbuf *buf, bufsize_t target_size);
 void cmark_strbuf_free(cmark_strbuf *buf);
 void cmark_strbuf_swap(cmark_strbuf *buf_a, cmark_strbuf *buf_b);
 
-size_t cmark_strbuf_len(const cmark_strbuf *buf);
+bufsize_t cmark_strbuf_len(const cmark_strbuf *buf);
 
 int cmark_strbuf_cmp(const cmark_strbuf *a, const cmark_strbuf *b);