diff --git a/src/Rokt-Kit.js b/src/Rokt-Kit.js
index b1574fd..f9f1e14 100644
--- a/src/Rokt-Kit.js
+++ b/src/Rokt-Kit.js
@@ -539,11 +539,19 @@ var constructor = function () {
     }
 
     function attachLauncher(accountId, launcherOptions) {
+        var mpSessionId =
+            window.mParticle &&
+            window.mParticle.sessionManager &&
+            typeof window.mParticle.sessionManager.getSession === 'function'
+                ? window.mParticle.sessionManager.getSession()
+                : undefined;
+
         var options = mergeObjects(
             {
                 accountId: accountId,
             },
-            launcherOptions || {}
+            launcherOptions || {},
+            mpSessionId ? { mpSessionId: mpSessionId } : {}
         );
 
         if (isPartnerInLocalLauncherTestGroup()) {
diff --git a/test/src/tests.js b/test/src/tests.js
index 2d05873..48bbce5 100644
--- a/test/src/tests.js
+++ b/test/src/tests.js
@@ -82,6 +82,11 @@ describe('Rokt Forwarder', () => {
     mParticle._Store = {
         localSessionAttributes: {},
     };
+    mParticle.sessionManager = {
+        getSession: function () {
+            return 'test-mp-session-id';
+        },
+    };
     mParticle._getActiveForwarders = function () {
         return [];
     };
@@ -114,6 +119,7 @@ describe('Rokt Forwarder', () => {
             self.integrationName = options.integrationName;
             self.noFunctional = options.noFunctional;
             self.noTargeting = options.noTargeting;
+            self.mpSessionId = options.mpSessionId;
             self.createLauncherCalled = true;
             self.isInitialized = true;
             self.sandbox = options.sandbox;
@@ -130,6 +136,7 @@ describe('Rokt Forwarder', () => {
             self.integrationName = options.integrationName;
             self.noFunctional = options.noFunctional;
             self.noTargeting = options.noTargeting;
+            self.mpSessionId = options.mpSessionId;
             self.createLocalLauncherCalled = true;
             self.isInitialized = true;
             self.sandbox = options.sandbox;
@@ -842,6 +849,40 @@ describe('Rokt Forwarder', () => {
 
             window.mParticle.Rokt.createLauncherCalled.should.equal(true);
         });
+
+        it('should pass mpSessionId from mParticle sessionManager to createLauncher', async () => {
+            window.mParticle.sessionManager = {
+                getSession: function () {
+                    return 'my-mp-session-123';
+                },
+            };
+
+            await window.mParticle.forwarder.init(
+                { accountId: '123456' },
+                reportService.cb,
+                true,
+                null,
+                {}
+            );
+
+            window.mParticle.Rokt.mpSessionId.should.equal('my-mp-session-123');
+        });
+
+        it('should not pass mpSessionId when sessionManager is unavailable', async () => {
+            delete window.mParticle.sessionManager;
+
+            await window.mParticle.forwarder.init(
+                { accountId: '123456' },
+                reportService.cb,
+                true,
+                null,
+                {}
+            );
+
+            (window.mParticle.Rokt.mpSessionId === undefined).should.equal(
+                true
+            );
+        });
     });
 
     describe('#selectPlacements', () => {