diff --git a/.changeset/thin-pandas-fetch.md b/.changeset/thin-pandas-fetch.md
new file mode 100644
index 00000000..435e0075
--- /dev/null
+++ b/.changeset/thin-pandas-fetch.md
@@ -0,0 +1,5 @@
+---
+"@theguild/federation-composition": patch
+---
+
+Fix in containsSupergraphSpec to treat directive definition as actual definition
diff --git a/__tests__/subgraph-validation-and-compositon-root-query.spec.ts b/__tests__/subgraph-validation-and-compositon-root-query.spec.ts
index 4abd8137..3e43926b 100644
--- a/__tests__/subgraph-validation-and-compositon-root-query.spec.ts
+++ b/__tests__/subgraph-validation-and-compositon-root-query.spec.ts
@@ -3,6 +3,7 @@ import { describe, expect, test } from "vitest";
 import { assertCompositionSuccess, composeServices } from "../src/compose.js";
 import { ServiceDefinition } from "../src/types.js";
 import { validate } from "../src/validate.js";
+import { containsSupergraphSpec } from "../src/graphql/contains-supergraph-spec.js";
 
 const serviceA: ServiceDefinition = {
   name: "serviceA",
@@ -51,8 +52,7 @@ describe("Test to validate custom root query is treated as Query", () => {
     const hasCustomRootQueryAsObjectType = supergraph.some(
       (def) =>
         def.kind === Kind.OBJECT_TYPE_DEFINITION &&
-        (def.name.value === "RootQuery" ||
-          def.name.value === "CustomQueryName"),
+        (def.name.value === "RootQuery" || def.name.value === "CustomQueryName")
     );
 
     expect(hasCustomRootQueryAsObjectType).eq(false);
@@ -76,3 +76,23 @@ describe("Test to validate custom root query is treated as Query", () => {
     }
   });
 });
+
+describe("Test to validate monolith schema is not treated as supergraph spec", () => {
+  test("Shouldn't treat properties with spec directive names as supergraph spec", () => {
+    const isSupergraph = containsSupergraphSpec(`#graphql
+      schema {
+        query: RootQueryType
+      }
+
+      type Link {
+        link: String
+      }
+
+      type RootQueryType {
+        foo: Link
+      }
+    `);
+
+    expect(isSupergraph).eq(false);
+  });
+});
diff --git a/src/graphql/contains-supergraph-spec.ts b/src/graphql/contains-supergraph-spec.ts
index 733932be..c53bfcbf 100644
--- a/src/graphql/contains-supergraph-spec.ts
+++ b/src/graphql/contains-supergraph-spec.ts
@@ -15,7 +15,7 @@ export function containsSupergraphSpec(sdl: string): boolean {
   const patterns: string[] = [];
 
   for (const { name, kind } of getSupergraphSpecNodes()) {
-    if (kind === Kind.DIRECTIVE) {
+    if (kind === Kind.DIRECTIVE || kind === Kind.DIRECTIVE_DEFINITION) {
       // "@NAME" for directives
       patterns.push(`@${name}`);
     } else {