diff --git a/src/init.c b/src/init.c
index b6dadf0..5f75421 100644
--- a/src/init.c
+++ b/src/init.c
@@ -25,9 +25,9 @@ static int _winsock_global_init(void) {
 static BOOL CALLBACK _init_once_callback(INIT_ONCE* once,
                                          void* parameter,
                                          void** context) {
-  unused(once);
-  unused(parameter);
-  unused(context);
+  unused_var(once);
+  unused_var(parameter);
+  unused_var(context);
 
   if (_winsock_global_init() < 0 || nt_global_init() < 0 ||
       reflock_global_init() < 0 || api_global_init() < 0)
diff --git a/src/port.c b/src/port.c
index 4505321..47a569c 100644
--- a/src/port.c
+++ b/src/port.c
@@ -385,7 +385,7 @@ poll_group_t* ep_port_acquire_poll_group(
 
 void ep_port_release_poll_group(ep_port_t* port_info,
                                 poll_group_t* poll_group) {
-  unused(port_info);
+  unused_var(port_info);
   poll_group_release(poll_group);
 }
 
@@ -397,7 +397,7 @@ void ep_port_request_socket_update(ep_port_t* port_info,
 }
 
 void ep_port_cancel_socket_update(ep_port_t* port_info, ep_sock_t* sock_info) {
-  unused(port_info);
+  unused_var(port_info);
   if (!queue_enqueued(&sock_info->queue_node))
     return;
   queue_remove(&sock_info->queue_node);
@@ -411,7 +411,7 @@ void ep_port_add_deleted_socket(ep_port_t* port_info, ep_sock_t* sock_info) {
 
 void ep_port_remove_deleted_socket(ep_port_t* port_info,
                                    ep_sock_t* sock_info) {
-  unused(port_info);
+  unused_var(port_info);
   if (!queue_enqueued(&sock_info->queue_node))
     return;
   queue_remove(&sock_info->queue_node);
diff --git a/src/reflock.c b/src/reflock.c
index 9463ee1..a8a51f9 100644
--- a/src/reflock.c
+++ b/src/reflock.c
@@ -64,7 +64,7 @@ static inline uint32_t _sync_fetch_and_set(volatile uint32_t* target,
 
 void reflock_ref(reflock_t* reflock) {
   uint32_t state = _sync_add_and_fetch(&reflock->state, _REF);
-  unused(state);
+  unused_var(state);
   assert((state & _DESTROY_MASK) == 0); /* Overflow or destroyed. */
 }
 
@@ -73,8 +73,8 @@ void reflock_unref(reflock_t* reflock) {
   uint32_t ref_count = state & _REF_MASK;
   uint32_t destroy = state & _DESTROY_MASK;
 
-  unused(ref_count);
-  unused(destroy);
+  unused_var(ref_count);
+  unused_var(destroy);
 
   if (state == _DESTROY)
     _signal_event(reflock);
diff --git a/src/util.h b/src/util.h
index eb42632..ce9af95 100644
--- a/src/util.h
+++ b/src/util.h
@@ -18,7 +18,7 @@ typedef intptr_t ssize_t;
 #define safe_container_of(ptr, type, member) \
   ((type*) util_safe_container_of_helper((ptr), offsetof(type, member)))
 
-#define unused(v) ((void) (v))
+#define unused_var(v) ((void) (v))
 
 #if defined(_MSC_VER) && _MSC_VER < 1900
 /* Polyfill `inline` for msvc 12 (Visual Studio 2013) */