diff --git a/src/pipewire/buffers.c b/src/pipewire/buffers.c
index 1164a9c71..072d03f76 100644
--- a/src/pipewire/buffers.c
+++ b/src/pipewire/buffers.c
@@ -39,7 +39,7 @@
 #define NAME "buffers"
 
 #define MAX_ALIGN	32
-#define MAX_BLOCKS	4
+#define MAX_BLOCKS	4u
 
 struct port {
 	struct spa_node *node;