diff --git a/src/threading/BasicThread.cc b/src/threading/BasicThread.cc
index f111028475..95bfd8acd0 100644
--- a/src/threading/BasicThread.cc
+++ b/src/threading/BasicThread.cc
@@ -1,5 +1,4 @@
 
-#include <sys/signal.h>
 #include <signal.h>
 
 #include "bro-config.h"