diff --git a/crates/cairo-lang-semantic/src/expr/test_data/impl b/crates/cairo-lang-semantic/src/expr/test_data/impl
index 2d56056a1ec..badc8707a7c 100644
--- a/crates/cairo-lang-semantic/src/expr/test_data/impl
+++ b/crates/cairo-lang-semantic/src/expr/test_data/impl
@@ -43,27 +43,7 @@ error: Type not found.
     fn foo(x: T, y: u8, z: u16) -> T {}
                                    ^
 
-error: Parameter type of impl function `MyImpl::foo` is incompatible with `MyTrait::foo`. Expected: `core::integer::u8`, actual: `<missing>`.
- --> lib.cairo:7:15
-    fn foo(x: T, y: u8, z: u16) -> T {}
-              ^
-
-error: Parameter type of impl function `MyImpl::foo` is incompatible with `MyTrait::foo`. Expected: `<missing>`, actual: `core::integer::u8`.
- --> lib.cairo:7:21
-    fn foo(x: T, y: u8, z: u16) -> T {}
-                    ^^
-
 error: Parameter type of impl function `MyImpl::foo` is incompatible with `MyTrait::foo`. Expected: `core::integer::u8`, actual: `core::integer::u16`.
  --> lib.cairo:7:28
     fn foo(x: T, y: u8, z: u16) -> T {}
                            ^*^
-
-error: Return type of impl function `MyImpl::foo` is incompatible with `MyTrait::foo`. Expected: `core::integer::u8`, actual: `<missing>`.
- --> lib.cairo:7:36
-    fn foo(x: T, y: u8, z: u16) -> T {}
-                                   ^
-
-error: Return type of impl function `MyImpl::bar` is incompatible with `MyTrait::bar`. Expected: `<missing>`, actual: `core::integer::u8`.
- --> lib.cairo:8:17
-    fn bar() -> u8 {
-                ^^
diff --git a/crates/cairo-lang-semantic/src/items/imp.rs b/crates/cairo-lang-semantic/src/items/imp.rs
index d2978a0804d..1fe599502f7 100644
--- a/crates/cairo-lang-semantic/src/items/imp.rs
+++ b/crates/cairo-lang-semantic/src/items/imp.rs
@@ -3111,7 +3111,7 @@ fn validate_impl_function_signature(
         let expected_ty = inference.rewrite(trait_param.ty).no_err();
         let actual_ty = inference.rewrite(param.ty).no_err();
 
-        if expected_ty != actual_ty {
+        if expected_ty != actual_ty && !expected_ty.is_missing(db) && !actual_ty.is_missing(db) {
             diagnostics.report(
                 &extract_matches!(
                     signature_syntax.parameters(syntax_db).elements(syntax_db)[idx]
@@ -3167,7 +3167,7 @@ fn validate_impl_function_signature(
     let expected_ty = inference.rewrite(concrete_trait_signature.return_type).no_err();
     let actual_ty = inference.rewrite(signature.return_type).no_err();
 
-    if expected_ty != actual_ty {
+    if expected_ty != actual_ty && !expected_ty.is_missing(db) && !actual_ty.is_missing(db) {
         let location_ptr = match signature_syntax.ret_ty(syntax_db) {
             OptionReturnTypeClause::ReturnTypeClause(ret_ty) => {
                 ret_ty.ty(syntax_db).as_syntax_node()