diff --git a/src/wmfs.c b/src/wmfs.c
index 269a456..b22c4cf 100644
--- a/src/wmfs.c
+++ b/src/wmfs.c
@@ -33,7 +33,6 @@
 #include "wmfs.h"
 
 static volatile bool exiting = False, sig_chld = False;
-static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
 
 int
 errorhandler(Display *d, XErrorEvent *event)