diff --git a/dwscr.cc b/dwscr.cc
index eacbf66..2c6c27c 100644
--- a/dwscr.cc
+++ b/dwscr.cc
@@ -12,6 +12,7 @@
 #include <string>
 #include <SDL.h>
 #include <SDL_syswm.h>
+#include <stdlib.h>
 #ifndef WITHOUT_ODE
 #include <ode/ode.h>
 #endif