diff --git a/src/projectile.c b/src/projectile.c
index cc461ba..0c7a487 100644
--- a/src/projectile.c
+++ b/src/projectile.c
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <stdlib.h>
 #include "projectile.h"
 #include "util.h"
 #include "texturecache.h"