diff --git a/ruma-api-macros/src/api.rs b/ruma-api-macros/src/api.rs
index 8fd550a3..1973fa41 100644
--- a/ruma-api-macros/src/api.rs
+++ b/ruma-api-macros/src/api.rs
@@ -160,9 +160,9 @@ impl ToTokens for Api {
         {
             let body_lifetimes = if self.request.has_body_lifetimes() {
                 // duplicate the anonymous lifetime as many times as needed
-                let anon = quote! { '_, };
-                let lifetimes = vec![&anon].repeat(self.request.body_lifetime_count());
-                quote! { < #( #lifetimes )* >}
+                let lifetimes =
+                    std::iter::repeat(quote! { '_ }).take(self.request.body_lifetime_count());
+                quote! { < #( #lifetimes, )* >}
             } else {
                 TokenStream::new()
             };
@@ -200,9 +200,9 @@ impl ToTokens for Api {
         {
             let body_lifetimes = if self.response.has_body_lifetimes() {
                 // duplicate the anonymous lifetime as many times as needed
-                let anon = quote! { '_, };
-                let lifetimes = vec![&anon].repeat(self.response.body_lifetime_count());
-                quote! { < #( #lifetimes )* >}
+                let lifetimes =
+                    std::iter::repeat(quote! { '_ }).take(self.response.body_lifetime_count());
+                quote! { < #( #lifetimes, )* >}
             } else {
                 TokenStream::new()
             };
diff --git a/ruma-api/tests/ruma_api_lifetime.rs b/ruma-api/tests/ruma_api_lifetime.rs
index b9c41076..4404d51a 100644
--- a/ruma-api/tests/ruma_api_lifetime.rs
+++ b/ruma-api/tests/ruma_api_lifetime.rs
@@ -1,5 +1,12 @@
 use ruma_identifiers::{RoomAliasId, RoomId};
 
+#[allow(unused)]
+#[derive(Copy, Clone, Debug, ruma_api::Outgoing, serde::Serialize)]
+pub struct OtherThing<'t> {
+    some: &'t str,
+    t: &'t [u8],
+}
+
 mod empty_response {
     use super::*;
 
@@ -54,18 +61,7 @@ mod nested_types {
 }
 
 mod full_request_response {
-    #[allow(unused)]
-    #[derive(Copy, Clone, Debug, serde::Deserialize, serde::Serialize)]
-    pub struct OtherThing<'t> {
-        some: &'t str,
-        t: &'t [u8],
-    }
-
-    #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
-    pub struct IncomingOtherThing {
-        some: String,
-        t: Vec<u8>,
-    }
+    use super::*;
 
     ruma_api::ruma_api! {
         metadata: {
@@ -97,18 +93,7 @@ mod full_request_response {
 }
 
 mod full_request_response_with_query_map {
-    #[allow(unused)]
-    #[derive(Copy, Clone, Debug, serde::Deserialize, serde::Serialize)]
-    pub struct OtherThing<'t> {
-        some: &'t str,
-        t: &'t [u8],
-    }
-
-    #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
-    pub struct IncomingOtherThing {
-        some: String,
-        t: Vec<u8>,
-    }
+    use super::*;
 
     ruma_api::ruma_api! {
         metadata: {
@@ -122,7 +107,7 @@ mod full_request_response_with_query_map {
 
         request: {
             #[ruma_api(query_map)]
-            // pub abc: &'a [(&'a str, &'a str)], // TODO This does not impl Deserialize
+            // pub abc: &'a [(&'a str, &'a str)], // TODO handle this use case
             pub abc: Vec<(String, String)>,
             #[ruma_api(path)]
             pub thing: &'a str,