diff --git a/rem/vidconv/vconv.c b/rem/vidconv/vconv.c
index 3b8c7f28f..97840d113 100644
--- a/rem/vidconv/vconv.c
+++ b/rem/vidconv/vconv.c
@@ -830,13 +830,13 @@ void vidconv_center(struct vidframe *dst, const struct vidframe *src,
 		double rh = (double)src->size.h / (double)r->h;
 		sc.size.w =
 			(unsigned)min((double)src->size.w, (double)r->w * rh);
-		sc.xoffs = ((src->size.w / rh) - r->w) / 2;
+		sc.xoffs = ((unsigned)(src->size.w / rh) - r->w) / 2;
 	}
 	else {
 		double rw = (double)src->size.w / (double)r->w;
 		sc.size.h =
 			(unsigned)min((double)src->size.h, (double)r->h * rw);
-		sc.yoffs = ((src->size.h / rw) - r->h) / 2;
+		sc.yoffs = ((unsigned)(src->size.h / rw) - r->h) / 2;
 	}
 
 	vidconv(dst, &sc, r);