diff --git a/src/buffer.c b/src/buffer.c
index d7f7ae1..60fb3fc 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -63,7 +63,7 @@
 
 	b->i += delta;
 
-	if (buffer_len(b) == 0)
+	if (buffer_empty(b))
 		b->p = b->data;
 
 	return delta;
diff --git a/src/raw_sock.c b/src/raw_sock.c
index 4c83a6f..20a867a 100644
--- a/src/raw_sock.c
+++ b/src/raw_sock.c
@@ -331,7 +331,7 @@
 			buf->o -= ret;
 			done += ret;
 
-			if (likely(!buffer_len(buf)))
+			if (likely(buffer_empty(buf)))
 				/* optimize data alignment in the buffer */
 				buf->p = buf->data;
 
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 99f22f6..3e74ce5 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -1167,7 +1167,7 @@
 			buf->o -= ret;
 			done += ret;
 
-			if (likely(!buffer_len(buf)))
+			if (likely(buffer_empty(buf)))
 				/* optimize data alignment in the buffer */
 				buf->p = buf->data;