diff --git a/src/system/libroot/posix/pthread/pthread.c b/src/system/libroot/posix/pthread/pthread.c
index c1cfd79b08..fe9adcd4a8 100644
--- a/src/system/libroot/posix/pthread/pthread.c
+++ b/src/system/libroot/posix/pthread/pthread.c
@@ -9,6 +9,7 @@
 
 #include <signal.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include <TLS.h>