diff --git a/eng/tools/typespec-validation/src/rules/sdk-tspconfig-validation.ts b/eng/tools/typespec-validation/src/rules/sdk-tspconfig-validation.ts
index 99bc46be890a..f8ad13d7a7bc 100644
--- a/eng/tools/typespec-validation/src/rules/sdk-tspconfig-validation.ts
+++ b/eng/tools/typespec-validation/src/rules/sdk-tspconfig-validation.ts
@@ -250,7 +250,7 @@ function skipForRestLevelClientOrManagementPlaneInTsEmitter(
   folder: string,
 ): SkipResult {
   const isRLCClient =
-    config?.options?.["@azure-tools/typespec-ts"]?.["is-modular-library"] !== true;
+    config?.options?.["@azure-tools/typespec-ts"]?.["is-modular-library"] === false;
   const shouldSkip = isManagementSdk(folder) || isRLCClient;
   const result: SkipResult = {
     shouldSkip: shouldSkip,
@@ -262,7 +262,7 @@ function skipForRestLevelClientOrManagementPlaneInTsEmitter(
 
 function skipForModularOrManagementPlaneInTsEmitter(config: any, folder: string): SkipResult {
   const isModularClient =
-    config?.options?.["@azure-tools/typespec-ts"]?.["is-modular-library"] === true;
+    config?.options?.["@azure-tools/typespec-ts"]?.["is-modular-library"] !== false;
   const shouldSkip = isManagementSdk(folder) || isModularClient;
   const result: SkipResult = {
     shouldSkip: shouldSkip,
diff --git a/eng/tools/typespec-validation/test/sdk-tspconfig-validation.test.ts b/eng/tools/typespec-validation/test/sdk-tspconfig-validation.test.ts
index 22ea52ec2b5d..ec06edf98465 100644
--- a/eng/tools/typespec-validation/test/sdk-tspconfig-validation.test.ts
+++ b/eng/tools/typespec-validation/test/sdk-tspconfig-validation.test.ts
@@ -247,6 +247,8 @@ const tsDpEmitterOutputDirTestCases = createEmitterOptionTestCases(
   "{output-dir}/{service-dir}/arm-aaa-rest",
   "{output-dir}/{service-dir}/aaa--rest",
   [new TspConfigTsDpEmitterOutputDirSubRule()],
+  false,
+  { "is-modular-library": false },
 );
 
 const tsDpPackageNameTestCases = createEmitterOptionTestCases(
@@ -256,6 +258,8 @@ const tsDpPackageNameTestCases = createEmitterOptionTestCases(
   "@azure-rest/aaa-bbb",
   "@azure/aaa-bbb",
   [new TspConfigTsRlcDpPackageNameMatchPatternSubRule()],
+  false,
+  { "is-modular-library": false },
 );
 
 const tsDpModularPackageNameTestCases = createEmitterOptionTestCases(
diff --git a/specification/confidentialledger/data-plane/ConfidentialLedger/tspconfig.yaml b/specification/confidentialledger/data-plane/ConfidentialLedger/tspconfig.yaml
index 97e67515fad9..6cea243102c2 100644
--- a/specification/confidentialledger/data-plane/ConfidentialLedger/tspconfig.yaml
+++ b/specification/confidentialledger/data-plane/ConfidentialLedger/tspconfig.yaml
@@ -36,5 +36,6 @@ options:
       "name": "@azure-rest/azure-confidentialledger"
       description: "Microsoft Confidential Ledger"
     "flavor": "azure"
+    is-modular-library: false
     generate-metadata: true
     generate-sample-project: false
diff --git a/specification/confidentialledger/data-plane/ConfidentialLedgerIdentity/tspconfig.yaml b/specification/confidentialledger/data-plane/ConfidentialLedgerIdentity/tspconfig.yaml
index 35d1c01761f6..12608c4275c3 100644
--- a/specification/confidentialledger/data-plane/ConfidentialLedgerIdentity/tspconfig.yaml
+++ b/specification/confidentialledger/data-plane/ConfidentialLedgerIdentity/tspconfig.yaml
@@ -36,5 +36,6 @@ options:
       "name": "@azure-rest/azure-confidentialledger-certificate"
       description: "Microsoft Confidential Ledger Certificate"
     "flavor": "azure"
+    is-modular-library: false
     generate-metadata: true
     generate-sample-project: false
diff --git a/specification/contosowidgetmanager/Contoso.WidgetManager/tspconfig.yaml b/specification/contosowidgetmanager/Contoso.WidgetManager/tspconfig.yaml
index 2e79b67159f8..6f9f92cebefb 100644
--- a/specification/contosowidgetmanager/Contoso.WidgetManager/tspconfig.yaml
+++ b/specification/contosowidgetmanager/Contoso.WidgetManager/tspconfig.yaml
@@ -32,7 +32,6 @@ options:
     model-namespace: false
   "@azure-tools/typespec-ts":
     emitter-output-dir: "{output-dir}/{service-dir}/contoso-widgetmanager"
-    is-modular-library: true
     package-details:
       name: "@azure/contoso-widgetmanager"
     flavor: azure