diff --git a/ruma-client-api/Cargo.toml b/ruma-client-api/Cargo.toml
index d81a264b..66ea9070 100644
--- a/ruma-client-api/Cargo.toml
+++ b/ruma-client-api/Cargo.toml
@@ -37,6 +37,5 @@ matches = "0.1.8"
 compat = []
 unstable-exhaustive-types = []
 unstable-pre-spec = []
-unstable-synapse-quirks = []
 client = []
 server = []
diff --git a/ruma-client-api/src/r0/profile/get_avatar_url.rs b/ruma-client-api/src/r0/profile/get_avatar_url.rs
index fc4992b9..eceb77ed 100644
--- a/ruma-client-api/src/r0/profile/get_avatar_url.rs
+++ b/ruma-client-api/src/r0/profile/get_avatar_url.rs
@@ -10,10 +10,7 @@ ruma_api! {
         name: "get_avatar_url",
         path: "/_matrix/client/r0/profile/:user_id/avatar_url",
         rate_limited: false,
-        #[cfg(not(feature = "unstable-synapse-quirks"))]
         authentication: None,
-        #[cfg(feature = "unstable-synapse-quirks")]
-        authentication: AccessToken,
     }
 
     request: {
diff --git a/ruma-client-api/src/r0/profile/get_display_name.rs b/ruma-client-api/src/r0/profile/get_display_name.rs
index ecd471c6..a1e517a9 100644
--- a/ruma-client-api/src/r0/profile/get_display_name.rs
+++ b/ruma-client-api/src/r0/profile/get_display_name.rs
@@ -10,10 +10,7 @@ ruma_api! {
         name: "get_display_name",
         path: "/_matrix/client/r0/profile/:user_id/displayname",
         rate_limited: false,
-        #[cfg(not(feature = "unstable-synapse-quirks"))]
         authentication: None,
-        #[cfg(feature = "unstable-synapse-quirks")]
-        authentication: AccessToken,
     }
 
     request: {
diff --git a/ruma-client-api/src/r0/profile/get_profile.rs b/ruma-client-api/src/r0/profile/get_profile.rs
index 5b898f11..94a500a9 100644
--- a/ruma-client-api/src/r0/profile/get_profile.rs
+++ b/ruma-client-api/src/r0/profile/get_profile.rs
@@ -10,10 +10,7 @@ ruma_api! {
         name: "get_profile",
         path: "/_matrix/client/r0/profile/:user_id",
         rate_limited: false,
-        #[cfg(not(feature = "unstable-synapse-quirks"))]
         authentication: None,
-        #[cfg(feature = "unstable-synapse-quirks")]
-        authentication: AccessToken,
     }
 
     request: {
diff --git a/ruma/Cargo.toml b/ruma/Cargo.toml
index 5519fe11..de4e4cac 100644
--- a/ruma/Cargo.toml
+++ b/ruma/Cargo.toml
@@ -116,6 +116,3 @@ unstable-pre-spec = [
     #"ruma-identity-service-api/unstable-pre-spec",
     #"ruma-push-gateway-api/unstable-pre-spec",
 ]
-unstable-synapse-quirks = [
-    "ruma-client-api/unstable-synapse-quirks",
-]
diff --git a/ruma/src/lib.rs b/ruma/src/lib.rs
index ca254ae7..523cb489 100644
--- a/ruma/src/lib.rs
+++ b/ruma/src/lib.rs
@@ -46,8 +46,6 @@
 //!   breaking changes when new fields are added in the specification. This feature compiles all
 //!   types as exhaustive.
 //! * `unstable-pre-spec` -- Upcoming Matrix features that may be subject to change or removal.
-//! * `unstable-synapse-quirks` -- Fix issues for clients expecting to connect to Synapse
-//!   homeservers, at the expense of being less compatible with other homeservers.
 //!
 //! # Common features
 //!