diff --git a/include/haproxy/thread-t.h b/include/haproxy/thread-t.h
index e82736164..bac83aedb 100644
--- a/include/haproxy/thread-t.h
+++ b/include/haproxy/thread-t.h
@@ -95,8 +95,8 @@
 /*** Common parts below ***/
 
 /* storage types used by spinlocks and RW locks */
-#define __HA_SPINLOCK_T     unsigned long
-#define __HA_RWLOCK_T       unsigned long
+#define __HA_SPINLOCK_T     unsigned int
+#define __HA_RWLOCK_T       unsigned int
 
 
 /* When thread debugging is enabled, we remap HA_SPINLOCK_T and HA_RWLOCK_T to