diff --git a/src/gui/gui-completion.c b/src/gui/gui-completion.c
index c10c496d5..2b4ca9063 100644
--- a/src/gui/gui-completion.c
+++ b/src/gui/gui-completion.c
@@ -25,6 +25,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <dirent.h>