diff --git a/src/software/scaling/context.rs b/src/software/scaling/context.rs
index 77cd331..72b8b7c 100644
--- a/src/software/scaling/context.rs
+++ b/src/software/scaling/context.rs
@@ -154,7 +154,7 @@ impl Context {
                 (*input.as_ptr()).data.as_ptr() as *const *const _,
                 (*input.as_ptr()).linesize.as_ptr() as *const _,
                 0,
-                self.output.height as c_int,
+                self.input.height as c_int,
                 (*output.as_mut_ptr()).data.as_ptr() as *const *mut _,
                 (*output.as_mut_ptr()).linesize.as_ptr() as *mut _,
             );