diff --git a/source/vid_3dfxsvga.c b/source/vid_3dfxsvga.c
index 104c0d3..094ae1f 100644
--- a/source/vid_3dfxsvga.c
+++ b/source/vid_3dfxsvga.c
@@ -36,6 +36,7 @@
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif
+3include <stdlib.h>
 #include <GL/gl.h>
 #include <GL/fxmesa.h>
 #include <glide/sst1vid.h>