diff --git a/ast/src/functions/function.rs b/ast/src/functions/function.rs
index c55daf03d3..efc3a6405e 100644
--- a/ast/src/functions/function.rs
+++ b/ast/src/functions/function.rs
@@ -77,13 +77,10 @@ impl Function {
     }
 
     ///
-    /// Returns a vector of [&FunctionInput] removing `self` and `mut self` inputs.
+    /// Returns an iterator of [&FunctionInput] removing `self` and `mut self` inputs.
     ///
-    pub fn filter_self_inputs(&self) -> Vec<&FunctionInput> {
-        self.input
-            .iter()
-            .filter(|input| !input.is_self())
-            .collect::<Vec<&FunctionInput>>()
+    pub fn filter_self_inputs(&self) -> impl Iterator<Item = &FunctionInput> {
+        self.input.iter().filter(|input| !input.is_self())
     }
 
     fn format(&self, f: &mut fmt::Formatter) -> fmt::Result {
diff --git a/compiler/src/function/function.rs b/compiler/src/function/function.rs
index d1f1d96f1d..4d58fc4a05 100644
--- a/compiler/src/function/function.rs
+++ b/compiler/src/function/function.rs
@@ -46,7 +46,7 @@ impl<F: Field + PrimeField, G: GroupType<F>> ConstrainedProgram<F, G> {
         let mut_self = function.contains_mut_self();
 
         // Store input values as new variables in resolved program
-        for (input_model, input_expression) in function.filter_self_inputs().iter().zip(input.into_iter()) {
+        for (input_model, input_expression) in function.filter_self_inputs().zip(input.into_iter()) {
             let (name, value) = match input_model {
                 FunctionInput::InputKeyword(keyword) => {
                     let value =