diff --git a/source/pcx.c b/source/pcx.c
index 4c958aa..c3403f3 100644
--- a/source/pcx.c
+++ b/source/pcx.c
@@ -290,7 +290,7 @@ pcx_get_args(int *ip)
 		if (expr_lablcnt == 0)
 			error("No tile table reference!");
 		if (expr_lablcnt > 1) {
-			expr_lablcnt = NULL;
+			expr_lablcnt = (int)NULL;
 			error("Too many tile table references!");
 		}
 		if (!pcx_set_tile(expr_lablptr, value))