diff --git a/src/threading.cpp b/src/threading.cpp
index 1de277259..cefe0ce8b 100644
--- a/src/threading.cpp
+++ b/src/threading.cpp
@@ -474,7 +474,7 @@ gb_internal void tpool_wait_on_addr(Futex *addr, Footex val) {
 	}
 }
 
-#if defined(GB_SYSTEM_FREEBSD)
+#elif defined(GB_SYSTEM_FREEBSD)
 
 #include <sys/types.h>
 #include <sys/umtx.h>