diff --git a/src/gui/render_templates.h b/src/gui/render_templates.h
index 59c08874..e1c1ddbd 100644
--- a/src/gui/render_templates.h
+++ b/src/gui/render_templates.h
@@ -382,9 +382,9 @@ static void conc3d(Cache,SBPP,DBPP) (const void * s) {
 	line0[0]=P;				\
 	line0[1]=P;				\
 	line0[2]=P;				\
-	line1[0]=0;				\
-	line1[1]=0;				\
-	line1[2]=0;				\
+	line1[0]=P;				\
+	line1[1]=P;				\
+	line1[2]=P;				\
 	line2[0]=0;				\
 	line2[1]=0;				\
 	line2[2]=0;