1 files changed, 1 insertions, 0 deletions

diff --git a/src/tree.c b/src/tree.c
index 436f632f..49c1d782 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -25,6 +25,7 @@
 
 #include <glade/glade.h>
 #include <string.h>
+#include <stdlib.h>
 #include "zenity.h"
 #include "util.h"