diff --git a/ringbuffer.c b/ringbuffer.c
index 996dc49..5c485fc 100644
--- a/ringbuffer.c
+++ b/ringbuffer.c
@@ -125,7 +125,7 @@
 					    size_t len)
 {
 	enum ringbuffer_poll_ret prc;
-	int force_len;
+	size_t force_len;
 
 	if (ringbuffer_space(rbc) >= len)
 		return 0;