diff --git a/deku-derive/src/macros/deku_read.rs b/deku-derive/src/macros/deku_read.rs
index 5d76c3f2..d5225baa 100644
--- a/deku-derive/src/macros/deku_read.rs
+++ b/deku-derive/src/macros/deku_read.rs
@@ -403,8 +403,12 @@ fn emit_enum(input: &DekuData) -> Result<TokenStream, syn::Error> {
 
     // Implement `DekuEnumExt`
     if let Some(deku_id_type) = deku_id_type {
-        tokens.extend(quote! {
-            impl #imp DekuEnumExt<#lifetime, (#deku_id_type)> for #ident #wher {
+        if !imp.to_token_stream().is_empty() {
+            // Generics (#imp) are not supported, as our __deku
+            // would need to be appended to #imp
+        } else {
+            tokens.extend(quote! {
+            impl<'__deku> #imp ::#crate_::DekuEnumExt<#lifetime, (#deku_id_type)> for #ident #wher {
                 fn deku_id(&self) -> core::result::Result<(#deku_id_type), DekuError> {
                     match self {
                         #(#deku_ids ,)*
@@ -413,6 +417,7 @@ fn emit_enum(input: &DekuData) -> Result<TokenStream, syn::Error> {
                 }
             }
         });
+        }
     }
 
     // println!("{}", tokens.to_string());
diff --git a/deku-derive/src/macros/mod.rs b/deku-derive/src/macros/mod.rs
index 2fa865c3..fa5bf37b 100644
--- a/deku-derive/src/macros/mod.rs
+++ b/deku-derive/src/macros/mod.rs
@@ -4,6 +4,7 @@ use syn::parse::Parser;
 use syn::punctuated::Punctuated;
 use syn::spanned::Spanned;
 use syn::token::Comma;
+use syn::Lifetime;
 
 use crate::Num;
 
@@ -211,6 +212,10 @@ fn gen_type_from_ctx_id(
             if let syn::FnArg::Typed(pat_type) = arg {
                 if let syn::Pat::Ident(ident) = &*pat_type.pat {
                     if id == ident.ident {
+                        let mut pat_type = pat_type.clone();
+                        if let syn::Type::Reference(r) = pat_type.ty.as_mut() {
+                            r.lifetime = Some(Lifetime::new("'__deku", Span::call_site()));
+                        }
                         let ty = &pat_type.ty;
                         t = Some(quote! {#ty});
                     }
diff --git a/src/lib.rs b/src/lib.rs
index 64d36de5..54f463ed 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -452,7 +452,7 @@ pub trait DekuUpdate {
 }
 
 /// "Extended Enum" trait: obtain additional enum information
-pub trait DekuEnumExt<'a, T> {
+pub trait DekuEnumExt<'__deku, T> {
     /// Obtain `id` of a given enum variant
     fn deku_id(&self) -> Result<T, DekuError>;
 }