diff --git a/src/main.c b/src/main.c
index 559948f..e2d3b24 100644
--- a/src/main.c
+++ b/src/main.c
@@ -269,10 +269,12 @@ void SetupEnvironment(WScreen * scr)
 		strcat(tmp, buf);
 		putenv(tmp);
 	}
-	tmp = wmalloc(60);
-	snprintf(tmp, 60, "WRASTER_COLOR_RESOLUTION%i=%i", scr->screen,
-		 scr->rcontext->attribs->colors_per_channel);
-	putenv(tmp);
+	if (scr->rcontext) { /* Wayland: rcontext is NULL (no X11 colormap) */
+		tmp = wmalloc(60);
+		snprintf(tmp, 60, "WRASTER_COLOR_RESOLUTION%i=%i", scr->screen,
+			 scr->rcontext->attribs->colors_per_channel);
+		putenv(tmp);
+	}
 }
 
 typedef struct {