diff --git a/src/skill.c b/src/skill.c
index 6cee124..b4d96eb 100644
--- a/src/skill.c
+++ b/src/skill.c
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <stdlib.h>
 #include <string.h>
 #include "texturecache.h"
 #include "skill.h"