diff --git a/src/scale.rs b/src/scale.rs
index f4893ce..4c9f94b 100644
--- a/src/scale.rs
+++ b/src/scale.rs
@@ -63,9 +63,9 @@ impl Scaler {
             (*frame).width,
             (*frame).height,
             transmute((*frame).format),
-            self.width as libc::c_int,
-            self.height as libc::c_int,
-            transmute(self.format),
+            width as libc::c_int,
+            height as libc::c_int,
+            transmute(format),
             SWS_BILINEAR,
             ptr::null_mut(),
             ptr::null_mut(),