diff --git a/scenarios/grpc_car.js b/scenarios/grpc_car.js
index 2a3828f..c271d6e 100644
--- a/scenarios/grpc_car.js
+++ b/scenarios/grpc_car.js
@@ -63,7 +63,7 @@ if (registry_enabled) {
     )
 }
 
-const generator = datagen.generator(1024 * parseInt(__ENV.WRITE_OBJ_SIZE));
+const generator = datagen.generator(1024 * parseInt(__ENV.WRITE_OBJ_SIZE), __ENV.PAYLOAD_TYPE || "");
 
 const scenarios = {};
 
diff --git a/scenarios/local.js b/scenarios/local.js
index 648bead..cbcab65 100644
--- a/scenarios/local.js
+++ b/scenarios/local.js
@@ -47,7 +47,7 @@ if (registry_enabled && delete_age) {
     );
 }
 
-const generator = datagen.generator(1024 * parseInt(__ENV.WRITE_OBJ_SIZE));
+const generator = datagen.generator(1024 * parseInt(__ENV.WRITE_OBJ_SIZE), __ENV.PAYLOAD_TYPE || "");
 
 const scenarios = {};
 
diff --git a/scenarios/s3_car.js b/scenarios/s3_car.js
index 4fda3d0..a1f6402 100644
--- a/scenarios/s3_car.js
+++ b/scenarios/s3_car.js
@@ -62,7 +62,7 @@ if (registry_enabled) {
     )
 }
 
-const generator = datagen.generator(1024 * parseInt(__ENV.WRITE_OBJ_SIZE));
+const generator = datagen.generator(1024 * parseInt(__ENV.WRITE_OBJ_SIZE), __ENV.PAYLOAD_TYPE || "");
 
 const scenarios = {};
 
diff --git a/scenarios/s3local.js b/scenarios/s3local.js
index b04a6a3..71e89f8 100644
--- a/scenarios/s3local.js
+++ b/scenarios/s3local.js
@@ -61,7 +61,7 @@ if (registry_enabled) {
 
 const duration = __ENV.DURATION;
 
-const generator = datagen.generator(1024 * parseInt(__ENV.WRITE_OBJ_SIZE));
+const generator = datagen.generator(1024 * parseInt(__ENV.WRITE_OBJ_SIZE), __ENV.PAYLOAD_TYPE || "");
 
 const scenarios = {};