diff --git a/collector/common.h b/collector/common.h
index bfee363..812b4a9 100644
--- a/collector/common.h
+++ b/collector/common.h
@@ -19,6 +19,7 @@
 #include <sys/select.h>
 #include <sys/resource.h>
 #include <sys/socket.h>
+#include <sys/wait.h>
 
 #include <fcntl.h>
 #include <errno.h>