diff --git a/backend_ops/tensorrt/instance_norm/trt_instance_norm.cpp b/backend_ops/tensorrt/instance_norm/trt_instance_norm.cpp
index cb710e1c3..226967f2b 100644
--- a/backend_ops/tensorrt/instance_norm/trt_instance_norm.cpp
+++ b/backend_ops/tensorrt/instance_norm/trt_instance_norm.cpp
@@ -62,15 +62,15 @@ int TRTInstanceNormalization::enqueue(
   int elem_size = getElementSize(inputDesc[1].type);
 
   void* n_scales = (void*)workspace;
-  void* n_bias = (void*)(workspace + getAlignedSize(n * c * elem_size));
+  void* n_bias = (void*)((char*)workspace + getAlignedSize(n * c * elem_size));
 
   const void* scales = (const void*)inputs[1];
   const void* bias = (const void*)inputs[2];
 
   for (int i = 0; i < n; ++i) {
-    cudaMemcpyAsync(n_scales + i * c * elem_size, scales, c * elem_size,
+    cudaMemcpyAsync((char*)n_scales + i * c * elem_size, scales, c * elem_size,
                     cudaMemcpyDeviceToDevice, stream);
-    cudaMemcpyAsync(n_bias + i * c * elem_size, bias, c * elem_size,
+    cudaMemcpyAsync((char*)n_bias + i * c * elem_size, bias, c * elem_size,
                     cudaMemcpyDeviceToDevice, stream);
   }
 
diff --git a/backend_ops/tensorrt/roi_align/trt_roi_align.cpp b/backend_ops/tensorrt/roi_align/trt_roi_align.cpp
index da2263119..4bec0ce86 100644
--- a/backend_ops/tensorrt/roi_align/trt_roi_align.cpp
+++ b/backend_ops/tensorrt/roi_align/trt_roi_align.cpp
@@ -113,7 +113,7 @@ int TRTRoIAlign::enqueue(const nvinfer1::PluginTensorDesc *inputDesc,
   switch (mPoolMode) {
     case 0:  // max
       argmax_y = workSpace;
-      argmax_x = argmax_y + output_size * word_size;
+      argmax_x = (char *)argmax_y + output_size * word_size;
       break;
     case 1:  // avg
       break;