diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b531229d9..65c2f584c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: buildjet-2vcpu-ubuntu-2004
     strategy:
       matrix:
-        node-version: [ 18.x ]
+        node-version: [18.17.0]
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js ${{ matrix.node-version }}
@@ -97,7 +97,7 @@ jobs:
     runs-on: buildjet-2vcpu-ubuntu-2004
     strategy:
       matrix:
-        node-version: [ 18.x ]
+        node-version: [18.17.0]
         postgres-version: [ 14 ]
     services:
       postgres:
@@ -145,7 +145,7 @@ jobs:
     runs-on: buildjet-2vcpu-ubuntu-2004
     strategy:
       matrix:
-        node-version: [ 18.x ]
+        node-version: [18.17.0]
         mysql-version: [ 8.0 ]
     services:
       mysql:
@@ -192,7 +192,7 @@ jobs:
     runs-on: buildjet-2vcpu-ubuntu-2004
     strategy:
       matrix:
-        node-version: [ 18.x ]
+        node-version: [18.17.0]
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js ${{ matrix.node-version }}
@@ -229,7 +229,7 @@ jobs:
     runs-on: buildjet-2vcpu-ubuntu-2004
     strategy:
       matrix:
-        node-version: [ 18.x ]
+        node-version: [18.17.0]
         mongo-version: [ 4.0 ]
     services:
       # this is used for the simple-auth test
diff --git a/packages/type/src/reflection/type.ts b/packages/type/src/reflection/type.ts
index a698f2edf..730389bba 100644
--- a/packages/type/src/reflection/type.ts
+++ b/packages/type/src/reflection/type.ts
@@ -601,7 +601,7 @@ export function isSameType(a: Type, b: Type, stack: StackEntry[] = []): boolean
 
     try {
         if (a.kind !== b.kind) return false;
-        if (a.typeName !== b.typeName) return false;
+        if (a.typeName && b.typeName && a.typeName !== b.typeName) return false;
         if (a.kind === ReflectionKind.infer || b.kind === ReflectionKind.infer) return false;
 
         if (a.kind === ReflectionKind.literal) return a.literal === (b as TypeLiteral).literal;