diff --git a/modules/core/src/encoder/SemanticPreEncoder.ts b/modules/core/src/encoder/SemanticPreEncoder.ts
index 2875f7ef..9b465429 100644
--- a/modules/core/src/encoder/SemanticPreEncoder.ts
+++ b/modules/core/src/encoder/SemanticPreEncoder.ts
@@ -61,9 +61,17 @@ export class SemanticPreEncoder {
                 /**
                  * Per June 2021 Policy change, Vendors declaring only Special Purposes must
                  * have their legitimate interest Vendor bit set if they have been disclosed.
-                 * This empty block ensures their LI bit remains set
+                 * This block ensures their LI bit remains set
                  */
-
+                vector.set(vendorId);
+                } else if (gvlVendorKey === 'legIntPurposes' && vendor['purposes'].length > 0 && vendor['legIntPurposes'].length === 0 && vendor['specialPurposes'].length > 0
+              ) {
+                /**
+                 * Per June 2021 Policy change, Vendors declaring only Special Purposes must
+                 * have their legitimate interest Vendor bit set if they have been disclosed.
+                 * This block ensures their LI bit remains set
+                 */
+                vector.set(vendorId);
               } else {
 
                 /**
diff --git a/modules/core/test/TCString.test.ts b/modules/core/test/TCString.test.ts
index 2810fcf8..ddd1f497 100644
--- a/modules/core/test/TCString.test.ts
+++ b/modules/core/test/TCString.test.ts
@@ -120,6 +120,17 @@ describe('TCString', (): void => {
 
   });
 
+
+  // The next tests require that we use GVL tcf ver 2 and gvl version 51. If we update the tests to a newer GVL
+  // this test and the test against specific vendors that only set special purposes or only purposes and special
+  // purposes will need to be updated.
+  it('should use vendor list tcf ver 2 and gvl version 51', (): void => {
+    const gvl = getTCModel().gvl;
+
+    expect(gvl.gvlSpecificationVersion, `gvl.gvlSpecificationVersion === 2`).to.equal(2);
+    expect(gvl.vendorListVersion, `gvl.vendorListVersion == 51`).to.equal(51);
+  });
+
   it('should add a segment to a model on decode if a model is passed in', (): void => {
 
     const tcModel = getTCModel();
@@ -160,6 +171,10 @@ describe('TCString', (): void => {
 
           expect(newModel.vendorLegitimateInterests.has(id), `vendorLegitimateInterests.has(${id})`).to.be.true;
 
+        } else if (vendor && vendor.purposes.length > 0 && vendor.specialPurposes.length > 0) {
+
+            expect(newModel.vendorLegitimateInterests.has(id), `vendorLegitimateInterests.has(${id})`).to.be.true;
+  
         } else {
 
           expect(newModel.vendorLegitimateInterests.has(id), `vendorLegitimateInterests.has(${id})`).to.be.false;
@@ -196,6 +211,19 @@ describe('TCString', (): void => {
 
     });
 
+    tcModel.vendorLegitimateInterests.forEach((value: boolean, id: number): void => {
+      // gvl spec ver 2, gvl ver 51: vendor ids 415, 612 and 615 have special purposes only declared. LI needs to be true
+      if ( (id === 415 || id === 612 || id === 615 ) && value ) {
+        expect(newModel.vendorLegitimateInterests.has(id), `vendorLegitimateInterestsForSpecialPurpose.has(${id})`).to.be.true;
+      } 
+
+      // use case: The number of Vendors that have declared only purposes based on consent (no LI) + at least one SP
+      // sample set in v2-51: ids: 545, 553, 565, 570
+      if ( (id === 545 || id === 553 || id === 565 || id === 570) && value ) {
+        expect(newModel.vendorLegitimateInterests.has(id), `vendorConsentSetAndLegitimateInterestsForSpecialPurpose.has(${id})`).to.be.true;
+      }
+    });
+
     TCString.decode(publisherTC, newModel);
 
     tcModel.publisherConsents.forEach((value: boolean, id: number): void => {