diff --git a/src/wmlib/cdrom.c b/src/wmlib/cdrom.c
--- a/src/wmlib/cdrom.c
+++ b/src/wmlib/cdrom.c
@@ -38,6 +38,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <sys/types.h>
 
 #ifdef CAN_CLOSE