diff --git a/core/config_reader.c b/core/config_reader.c
index 451fc48..737d27c 100644
--- a/core/config_reader.c
+++ b/core/config_reader.c
@@ -17,7 +17,7 @@
 #include "../directories.h"
 #include "macros.h"
 #include <errno.h>
-
+#include <stdlib.h>
 /*
  * These variables are used to read the configuration.
  */
diff --git a/core/gimx.c b/core/gimx.c
index 700cae9..693f72f 100755
--- a/core/gimx.c
+++ b/core/gimx.c
@@ -8,7 +8,7 @@
 #include <errno.h> //to print errors
 #include <string.h> //to print errors
 #include <limits.h> //PATH_MAX
-
+#include <stdlib.h>
 #ifndef WIN32
 #include <termios.h> //to disable/enable echo
 #include <unistd.h>