diff --git a/Quake/gl_draw.c b/Quake/gl_draw.c
index c90a283e..e24ef62b 100644
--- a/Quake/gl_draw.c
+++ b/Quake/gl_draw.c
@@ -858,7 +858,7 @@ GL_Set2D -- johnfitz -- rewritten
 */
 void GL_Set2D (void)
 {
-	currentcanvas = -1;
+	currentcanvas = CANVAS_INVALID;
 	GL_SetCanvas (CANVAS_DEFAULT);
 
 	glDisable (GL_DEPTH_TEST);
diff --git a/Quake/screen.h b/Quake/screen.h
index a75a2125..761382f0 100644
--- a/Quake/screen.h
+++ b/Quake/screen.h
@@ -69,6 +69,7 @@ typedef enum {
 	CANVAS_BOTTOMLEFT,
 	CANVAS_BOTTOMRIGHT,
 	CANVAS_TOPRIGHT,
+	CANVAS_INVALID = -1
 } canvastype;
 extern	cvar_t		scr_menuscale;
 extern	cvar_t		scr_sbarscale;