diff --git a/engine/client/cl_cam.c b/engine/client/cl_cam.c
index d1cccd977..99cda1bb0 100644
--- a/engine/client/cl_cam.c
+++ b/engine/client/cl_cam.c
@@ -25,6 +25,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  * Player moves as a spectator, but the camera tracks and enemy player
  */
 
+#include <ctype.h>
+
 #include "quakedef.h"
 #include "winquake.h"