--- a/src/utils/smallut.cpp
+++ b/src/utils/smallut.cpp
@@ -763,7 +763,7 @@
         unit = " GB ";
         roundable = double(size) / 1E9;
     }
-    size = off_t(round(roundable));
+    size = int64_t(round(roundable));
     return lltodecstr(size).append(unit);
 }