diff --git a/drc/DRCbasic.c b/drc/DRCbasic.c
index 1ea451e2..0a6e1fdb 100644
--- a/drc/DRCbasic.c
+++ b/drc/DRCbasic.c
@@ -176,7 +176,7 @@ areaCheck(tile, arg)
 	unsigned int i;
 	int sqx, sqy;
 	int sdist = arg->dCD_radial & 0xfff;
-	long sstest, ssdist = sdist * sdist;
+	long sstest, ssdist = (long) sdist * sdist;
 
 	if ((arg->dCD_radial & RADIAL_NW) != 0)
 	{