diff --git a/flake.lock b/flake.lock
new file mode 100644
index 000000000..9e579c0a7
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1792773339,
+        "narHash": "sha256-rZLrzrC6i+jnTAlvPZHogKDulY7WWDEv9hJeHieO7Zw=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "3ec636362e1816bc2f0888fa0fa2c69f1bc9e504",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 000000000..35bbb1ecb
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,19 @@
+{
+  description = "My example flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }: {
+    devShells.x86_64-linux = {
+      default =
+        let
+          pkgs = nixpkgs.legacyPackages.x86_64-linux;
+        in
+        pkgs.mkShell {
+        	packages = with pkgs; [ go ];
+        };
+    };
+  };
+}
diff --git a/tests/csapi/apidoc_room_state_test.go b/tests/csapi/apidoc_room_state_test.go
index ff085efc3..5291e97de 100644
--- a/tests/csapi/apidoc_room_state_test.go
+++ b/tests/csapi/apidoc_room_state_test.go
@@ -87,6 +87,13 @@ func TestRoomState(t *testing.T) {
 		// sytest: GET /rooms/:room_id/joined_members fetches my membership
 		t.Run("GET /rooms/:room_id/joined_members fetches my membership", func(t *testing.T) {
 			t.Parallel()
+
+			avatarURL := "mxc://example.com/SEsfnsuifSDFSSEF"
+			reqBody := client.WithJSONBody(t, map[string]interface{}{
+				"avatar_url": avatarURL,
+			})
+			authedClient.MustDo(t, "PUT", []string{"_matrix", "client", "v3", "profile", authedClient.UserID, "avatar_url"}, reqBody)
+
 			roomID := authedClient.MustCreateRoom(t, map[string]interface{}{
 				"visibility": "public",
 				"preset":     "public_chat",
@@ -97,8 +104,8 @@ func TestRoomState(t *testing.T) {
 				JSON: []match.JSON{
 					match.JSONKeyPresent("joined"),
 					match.JSONKeyPresent("joined." + authedClient.UserID),
-					match.JSONKeyPresent("joined." + authedClient.UserID + ".display_name"),
-					match.JSONKeyPresent("joined." + authedClient.UserID + ".avatar_url"),
+					match.JSONKeyTypeEqual("joined."+authedClient.UserID+".display_name", gjson.String),
+					match.JSONKeyEqual("joined."+authedClient.UserID+".avatar_url", avatarURL),
 				},
 			})
 		})