diff --git a/src/software/scaling/context.rs b/src/software/scaling/context.rs
index 4c73280..969ca99 100644
--- a/src/software/scaling/context.rs
+++ b/src/software/scaling/context.rs
@@ -153,7 +153,7 @@ impl Context {
                 (*input.as_ptr()).linesize.as_ptr() as *const _,
                 0,
                 self.output.height as c_int,
-                (*output.as_mut_ptr()).data.as_ptr() as *const *const _,
+                (*output.as_mut_ptr()).data.as_ptr() as *const *mut _,
                 (*output.as_mut_ptr()).linesize.as_ptr() as *mut _,
             );
         }