diff --git a/src/fast_api.rs b/src/fast_api.rs
index 80c265a2..e4ac272a 100644
--- a/src/fast_api.rs
+++ b/src/fast_api.rs
@@ -250,9 +250,11 @@ impl<T: Default> FastApiTypedArray<T> {
 }
 
 pub trait FastFunction {
+  #[inline(always)]
   fn args(&self) -> &'static [Type] {
     &[]
   }
+  #[inline(always)]
   fn return_type(&self) -> CType {
     CType::Void
   }