diff --git a/src/config/schema.test.ts b/src/config/schema.test.ts
index bce33bad7b9..54aaa79c846 100644
--- a/src/config/schema.test.ts
+++ b/src/config/schema.test.ts
@@ -143,6 +143,32 @@ describe("config schema", () => {
     expect(channelProps?.accessToken).toBeTruthy();
   });
 
+  it("looks up plugin config paths for slash-delimited plugin ids", () => {
+    const res = buildConfigSchema({
+      plugins: [
+        {
+          id: "pack/one",
+          name: "Pack One",
+          configSchema: {
+            type: "object",
+            properties: {
+              provider: { type: "string" },
+            },
+          },
+        },
+      ],
+    });
+
+    const lookup = lookupConfigSchema(res, "plugins.entries.pack/one.config");
+    expect(lookup?.path).toBe("plugins.entries.pack/one.config");
+    expect(lookup?.hintPath).toBe("plugins.entries.pack/one.config");
+    expect(lookup?.children.find((child) => child.key === "provider")).toMatchObject({
+      key: "provider",
+      path: "plugins.entries.pack/one.config.provider",
+      type: "string",
+    });
+  });
+
   it("adds heartbeat target hints with dynamic channels", () => {
     const res = buildConfigSchema(heartbeatChannelInput);
 
diff --git a/src/gateway/protocol/schema/config.ts b/src/gateway/protocol/schema/config.ts
index 78159549255..9d0ec876668 100644
--- a/src/gateway/protocol/schema/config.ts
+++ b/src/gateway/protocol/schema/config.ts
@@ -4,7 +4,7 @@ import { NonEmptyString } from "./primitives.js";
 const ConfigSchemaLookupPathString = Type.String({
   minLength: 1,
   maxLength: 1024,
-  pattern: "^[A-Za-z0-9_.\\[\\]\\-*]+$",
+  pattern: "^[A-Za-z0-9_./\\[\\]\\-*]+$",
 });
 
 export const ConfigGetParamsSchema = Type.Object({}, { additionalProperties: false });