diff --git a/services/__tests__/geocoding-v6.test.js b/services/__tests__/geocoding-v6.test.js
index 32a3752..8ac0cff 100644
--- a/services/__tests__/geocoding-v6.test.js
+++ b/services/__tests__/geocoding-v6.test.js
@@ -34,6 +34,7 @@ describe('forwardGeocode', () => {
       language: 'de',
       worldview: 'us',
       permanent: true,
+      sessionId: 'abc123',
 
       // structured input parameters will be ignored in normal mode
       address_line1: '12 main',
@@ -60,7 +61,8 @@ describe('forwardGeocode', () => {
         limit: 3,
         language: 'de',
         worldview: 'us',
-        permanent: 'true'
+        permanent: 'true',
+        sessionId: 'abc123'
       }
     });
   });
@@ -76,6 +78,7 @@ describe('forwardGeocode', () => {
       limit: 3,
       language: 'de',
       worldview: 'us',
+      sessionId: 'abc123',
 
       // structured input parameters will be picked
       address_line1: '12 main',
@@ -99,6 +102,7 @@ describe('forwardGeocode', () => {
         limit: 3,
         language: 'de',
         worldview: 'us',
+        sessionId: 'abc123',
 
         address_line1: '12 main',
         address_number: '12',
@@ -140,7 +144,8 @@ describe('reverseGeocode', () => {
       limit: 3,
       language: 'de',
       worldview: 'us',
-      permanent: true
+      permanent: true,
+      sessionId: 'abc123'
     });
     expect(tu.requestConfig(geocoding)).toEqual({
       method: 'GET',
@@ -153,7 +158,8 @@ describe('reverseGeocode', () => {
         limit: 3,
         language: 'de',
         worldview: 'us',
-        permanent: 'true'
+        permanent: 'true',
+        sessionId: 'abc123'
       }
     });
   });
diff --git a/services/__tests__/geocoding.test.js b/services/__tests__/geocoding.test.js
index d6d2b55..cbae233 100644
--- a/services/__tests__/geocoding.test.js
+++ b/services/__tests__/geocoding.test.js
@@ -37,7 +37,8 @@ describe('forwardGeocode', () => {
       language: ['de', 'bs'],
       routing: true,
       fuzzyMatch: true,
-      worldview: 'us'
+      worldview: 'us',
+      sessionId: 'abc123'
     });
     expect(tu.requestConfig(geocoding)).toEqual({
       method: 'GET',
@@ -56,7 +57,8 @@ describe('forwardGeocode', () => {
         language: ['de', 'bs'],
         routing: 'true',
         fuzzyMatch: 'true',
-        worldview: 'us'
+        worldview: 'us',
+        sessionId: 'abc123'
       }
     });
   });
@@ -89,7 +91,8 @@ describe('reverseGeocode', () => {
       language: ['de', 'bs'],
       reverseMode: 'distance',
       routing: true,
-      worldview: 'us'
+      worldview: 'us',
+      sessionId: 'abc123'
     });
     expect(tu.requestConfig(geocoding)).toEqual({
       method: 'GET',
@@ -106,7 +109,8 @@ describe('reverseGeocode', () => {
         language: ['de', 'bs'],
         reverseMode: 'distance',
         routing: 'true',
-        worldview: 'us'
+        worldview: 'us',
+        sessionId: 'abc123'
       }
     });
   });
diff --git a/services/geocoding-v6.js b/services/geocoding-v6.js
index c04286b..80ea916 100644
--- a/services/geocoding-v6.js
+++ b/services/geocoding-v6.js
@@ -129,6 +129,7 @@ GeocodingV6.forwardGeocode = function(config) {
       worldview: v.string,
       autocomplete: v.boolean,
       permanent: v.boolean,
+      sessionId: v.string,
 
       // structured input fields
       address_line1: v.string,
@@ -168,7 +169,8 @@ GeocodingV6.forwardGeocode = function(config) {
         'limit',
         'worldview',
         'autocomplete',
-        'permanent'
+        'permanent',
+        'sessionId'
       ])
     )
   );
@@ -220,7 +222,8 @@ GeocodingV6.reverseGeocode = function(config) {
     limit: v.number,
     language: v.string,
     worldview: v.string,
-    permanent: v.boolean
+    permanent: v.boolean,
+    sessionId: v.string
   })(config);
 
   var query = stringifyBooleans(
@@ -233,7 +236,8 @@ GeocodingV6.reverseGeocode = function(config) {
         'limit',
         'language',
         'worldview',
-        'permanent'
+        'permanent',
+        'sessionId'
       ])
     )
   );
diff --git a/services/geocoding.js b/services/geocoding.js
index 02f2814..2100e25 100644
--- a/services/geocoding.js
+++ b/services/geocoding.js
@@ -104,7 +104,8 @@ Geocoding.forwardGeocode = function(config) {
     language: v.arrayOf(v.string),
     routing: v.boolean,
     fuzzyMatch: v.boolean,
-    worldview: v.string
+    worldview: v.string,
+    sessionId: v.string
   })(config);
 
   config.mode = config.mode || 'mapbox.places';
@@ -121,7 +122,8 @@ Geocoding.forwardGeocode = function(config) {
         'language',
         'routing',
         'fuzzyMatch',
-        'worldview'
+        'worldview',
+        'sessionId'
       ])
     )
   );
@@ -176,7 +178,8 @@ Geocoding.reverseGeocode = function(config) {
     language: v.arrayOf(v.string),
     reverseMode: v.oneOf('distance', 'score'),
     routing: v.boolean,
-    worldview: v.string
+    worldview: v.string,
+    sessionId: v.string
   })(config);
 
   config.mode = config.mode || 'mapbox.places';
@@ -192,7 +195,8 @@ Geocoding.reverseGeocode = function(config) {
         'language',
         'reverseMode',
         'routing',
-        'worldview'
+        'worldview',
+        'sessionId'
       ])
     )
   );