Add the 'c' flag to 'concealcursor'.
diff --git a/src/screen.c b/src/screen.c
index 70805d5..1756fc0 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -605,6 +605,8 @@
 	c = 'i';
     else if (State & NORMAL)
 	c = 'n';
+    else if (State & CMDLINE)
+	c = 'c';
     else
 	return FALSE;
     return vim_strchr(wp->w_p_cocu, c) != NULL;