diff --git a/Userland/Libraries/LibThreading/ConditionVariable.h b/Userland/Libraries/LibThreading/ConditionVariable.h
index cf8b63ef25..6996de7eb9 100644
--- a/Userland/Libraries/LibThreading/ConditionVariable.h
+++ b/Userland/Libraries/LibThreading/ConditionVariable.h
@@ -9,7 +9,6 @@
 #include <AK/Function.h>
 #include <LibThreading/Mutex.h>
 #include <pthread.h>
-#include <sys/cdefs.h>
 #include <sys/types.h>
 
 namespace Threading {