diff --git a/crates/hir-ty/src/method_resolution.rs b/crates/hir-ty/src/method_resolution.rs
index c07bd08be4..8ba8071d36 100644
--- a/crates/hir-ty/src/method_resolution.rs
+++ b/crates/hir-ty/src/method_resolution.rs
@@ -30,8 +30,8 @@ use crate::{
     utils::all_super_traits,
     AdtId, Canonical, CanonicalVarKinds, DebruijnIndex, DynTyExt, ForeignDefId, GenericArgData,
     Goal, Guidance, InEnvironment, Interner, Mutability, Scalar, Solution, Substitution,
-    TraitEnvironment, TraitRef, TraitRefExt, Ty, TyBuilder, TyExt, TyKind, VariableKind,
-    WhereClause,
+    TraitEnvironment, TraitRef, TraitRefExt, Ty, TyBuilder, TyExt, TyKind, TyVariableKind,
+    VariableKind, WhereClause,
 };
 
 /// This is used as a key for indexing impls.
@@ -1083,6 +1083,11 @@ fn iterate_method_candidates_by_receiver(
     table.run_in_snapshot(|table| {
         let mut autoderef = autoderef::Autoderef::new(table, receiver_ty.clone(), true);
         while let Some((self_ty, _)) = autoderef.next() {
+            if matches!(self_ty.kind(Interner), TyKind::InferenceVar(_, TyVariableKind::General)) {
+                // don't try to resolve methods on unknown types
+                return ControlFlow::Continue(());
+            }
+
             iterate_trait_method_candidates(
                 &self_ty,
                 autoderef.table,
diff --git a/crates/hir-ty/src/tests/method_resolution.rs b/crates/hir-ty/src/tests/method_resolution.rs
index 360a129283..14e2e74653 100644
--- a/crates/hir-ty/src/tests/method_resolution.rs
+++ b/crates/hir-ty/src/tests/method_resolution.rs
@@ -2099,3 +2099,42 @@ fn test() {
 "#,
     );
 }
+
+#[test]
+fn mismatched_args_due_to_supertraits_with_deref() {
+    check_no_mismatches(
+        r#"
+//- minicore: deref
+use core::ops::Deref;
+
+trait Trait1 {
+    type Assoc: Deref<Target = String>;
+}
+
+trait Trait2: Trait1 {
+}
+
+trait Trait3 {
+    type T1: Trait1;
+    type T2: Trait2;
+    fn bar(&self, x: bool, y: bool);
+}
+
+struct Foo;
+
+impl Foo {
+    fn bar(&mut self, _: &'static str) {}
+}
+
+impl Deref for Foo {
+    type Target = u32;
+    fn deref(&self) -> &Self::Target { &0 }
+}
+
+fn problem_method<T: Trait3>() {
+    let mut foo = Foo;
+    foo.bar("hello"); // Rustc ok, RA errors (mismatched args)
+}
+"#,
+    );
+}
diff --git a/crates/ide/src/syntax_highlighting/tests.rs b/crates/ide/src/syntax_highlighting/tests.rs
index 5f711600a2..2070022d41 100644
--- a/crates/ide/src/syntax_highlighting/tests.rs
+++ b/crates/ide/src/syntax_highlighting/tests.rs
@@ -1238,7 +1238,7 @@ fn benchmark_syntax_highlighting_parser() {
             })
             .count()
     };
-    assert_eq!(hash, 1169);
+    assert_eq!(hash, 1167);
 }
 
 #[test]