diff --git a/facial_landmark_detection/ssd_mobilenetv2_face_nchw.js b/facial_landmark_detection/ssd_mobilenetv2_face_nchw.js
index 7b7ef186..94ab87ea 100644
--- a/facial_landmark_detection/ssd_mobilenetv2_face_nchw.js
+++ b/facial_landmark_detection/ssd_mobilenetv2_face_nchw.js
@@ -85,6 +85,8 @@ ${nameArray[1]}`;
       } else {
         options.activation = this.builder_.clamp({minValue: 0, maxValue: 6});
       }
+    } else {
+      options.activation = undefined;
     }
     return this.builder_.conv2d(input, weights, options);
   }
diff --git a/facial_landmark_detection/ssd_mobilenetv2_face_nhwc.js b/facial_landmark_detection/ssd_mobilenetv2_face_nhwc.js
index 3e9ffd61..e4039dc3 100644
--- a/facial_landmark_detection/ssd_mobilenetv2_face_nhwc.js
+++ b/facial_landmark_detection/ssd_mobilenetv2_face_nhwc.js
@@ -92,6 +92,8 @@ ${nameArray[1]}`;
       } else {
         options.activation = this.builder_.clamp({minValue: 0, maxValue: 6});
       }
+    } else {
+      options.activation = undefined;
     }
     return this.builder_.conv2d(input, weights, options);
   }
diff --git a/image_classification/mobilenet_nhwc.js b/image_classification/mobilenet_nhwc.js
index 24391bc8..c5723669 100644
--- a/image_classification/mobilenet_nhwc.js
+++ b/image_classification/mobilenet_nhwc.js
@@ -40,6 +40,8 @@ export class MobileNetV2Nhwc {
       } else {
         options.activation = this.builder_.clamp({minValue: 0, maxValue: 6});
       }
+    } else {
+      options.activation = undefined;
     }
     return this.builder_.conv2d(input, weights, options);
   }
diff --git a/semantic_segmentation/deeplabv3_mnv2_nhwc.js b/semantic_segmentation/deeplabv3_mnv2_nhwc.js
index d952051c..2e16c566 100644
--- a/semantic_segmentation/deeplabv3_mnv2_nhwc.js
+++ b/semantic_segmentation/deeplabv3_mnv2_nhwc.js
@@ -54,6 +54,8 @@ export class DeepLabV3MNV2Nhwc {
       } else {
         options.activation = this.builder_.clamp({minValue: 0, maxValue: 6});
       }
+    } else {
+      options.activation = undefined;
     }
     return this.builder_.conv2d(input, weights, options);
   }