diff --git a/lib/ur/memsize_darwin.go b/lib/ur/memsize_darwin.go
index 596af4c95..0d19921e0 100644
--- a/lib/ur/memsize_darwin.go
+++ b/lib/ur/memsize_darwin.go
@@ -13,5 +13,5 @@ func memorySize() int64 {
 	if err != nil {
 		return 0
 	}
-	return mem
+	return int64(mem)
 }