diff --git a/agb/src/syscall.rs b/agb/src/syscall.rs
index a5cc1ed2..0129daf0 100644
--- a/agb/src/syscall.rs
+++ b/agb/src/syscall.rs
@@ -115,6 +115,7 @@ pub fn affine_matrix(x_scale: Num<8>, y_scale: Num<8>, rotation: u8) -> AffineMa
     };
 
     #[allow(dead_code)]
+    #[repr(C, packed)]
     struct Input {
         x_scale: i16,
         y_scale: i16,