diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index cd32e59..181672b 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,5 +1,5 @@
 {
   "git": {
-    "sha1": "46e46dcc8ed0279028b83f1ff623ee6cfe9ef65e"
+    "sha1": "f54e5f2a4ad7fad8700b1c809d6c96893388b30d"
   }
 }
diff --git a/Android.bp b/Android.bp
index 4e87f35..c5fb16d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -15,5 +15,5 @@
 // dependent_library ["feature_list"]
 //   proc-macro2-1.0.24 "default,proc-macro"
 //   quote-1.0.7 "default,proc-macro"
-//   syn-1.0.48 "clone-impls,default,derive,extra-traits,full,parsing,printing,proc-macro,quote,visit,visit-mut"
+//   syn-1.0.51 "clone-impls,default,derive,extra-traits,full,parsing,printing,proc-macro,quote,visit,visit-mut"
 //   unicode-xid-0.2.1 "default"
diff --git a/Cargo.toml b/Cargo.toml
index 54bab1a..0f21963 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@
 [package]
 edition = "2018"
 name = "async-trait"
-version = "0.1.41"
+version = "0.1.42"
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 description = "Type erasure for async trait methods"
 documentation = "https://docs.rs/async-trait"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 9a9ed1d..ea0f3d4 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,6 +1,6 @@
 [package]
 name = "async-trait"
-version = "0.1.41"
+version = "0.1.42"
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 edition = "2018"
 license = "MIT OR Apache-2.0"
diff --git a/METADATA b/METADATA
index 5a455fd..8d7bc4f 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/async-trait/async-trait-0.1.41.crate"
+    value: "https://static.crates.io/crates/async-trait/async-trait-0.1.42.crate"
   }
-  version: "0.1.41"
+  version: "0.1.42"
   license_type: NOTICE
   last_upgrade_date {
     year: 2020
-    month: 10
-    day: 26
+    month: 11
+    day: 24
   }
 }
diff --git a/src/expand.rs b/src/expand.rs
index aac8e46..fb83df1 100644
--- a/src/expand.rs
+++ b/src/expand.rs
@@ -72,7 +72,9 @@
                         if let Some(block) = block {
                             has_self |= has_self_in_block(block);
                             transform_block(context, sig, block, has_self, is_local);
-                            method.attrs.push(parse_quote!(#[allow(clippy::used_underscore_binding)]));
+                            method
+                                .attrs
+                                .push(parse_quote!(#[allow(clippy::used_underscore_binding)]));
                         }
                         let has_default = method.default.is_some();
                         transform_sig(context, sig, has_self, has_default, is_local);
@@ -102,7 +104,9 @@
                         let has_self = has_self_in_sig(sig) || has_self_in_block(block);
                         transform_block(context, sig, block, has_self, is_local);
                         transform_sig(context, sig, has_self, false, is_local);
-                        method.attrs.push(parse_quote!(#[allow(clippy::used_underscore_binding)]));
+                        method
+                            .attrs
+                            .push(parse_quote!(#[allow(clippy::used_underscore_binding)]));
                     }
                 }
             }
@@ -414,10 +418,22 @@
             if !is_local {
                 self_param.bounds.extend(self_bound);
             }
+            let count = standalone
+                .generics
+                .params
+                .iter()
+                .take_while(|param| {
+                    if let GenericParam::Const(_) = param {
+                        false
+                    } else {
+                        true
+                    }
+                })
+                .count();
             standalone
                 .generics
                 .params
-                .push(GenericParam::Type(self_param));
+                .insert(count, GenericParam::Type(self_param));
             types.push(Ident::new("Self", Span::call_site()));
         }
     }
diff --git a/src/lib.rs b/src/lib.rs
index f0102d8..929af4f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -303,6 +303,8 @@
 //! let object = &value as &dyn ObjectSafe;
 //! ```
 
+#![allow(clippy::match_like_matches_macro)] // matches! requires Rust 1.42
+
 extern crate proc_macro;
 
 mod args;
diff --git a/tests/test.rs b/tests/test.rs
index 002fd20..5fc238b 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -1,4 +1,7 @@
-#![cfg_attr(async_trait_nightly_testing, feature(specialization, const_generics))]
+#![cfg_attr(
+    async_trait_nightly_testing,
+    feature(min_specialization, min_const_generics)
+)]
 
 use async_trait::async_trait;
 
@@ -1048,3 +1051,29 @@
         }
     }
 }
+
+// https://github.com/dtolnay/async-trait/issues/134
+#[cfg(async_trait_nightly_testing)]
+pub mod issue134 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait TestTrait {
+        async fn run<const DUMMY: bool>(self)
+        where
+            Self: Sized,
+        {
+        }
+    }
+
+    pub struct TestStruct;
+
+    #[async_trait]
+    impl TestTrait for TestStruct {
+        async fn run<const DUMMY: bool>(self)
+        where
+            Self: Sized,
+        {
+        }
+    }
+}