diff --git a/src/gpu/vk/GrVkBuffer.cpp b/src/gpu/vk/GrVkBuffer.cpp
index ff809eb50f..e8fe619a43 100644
--- a/src/gpu/vk/GrVkBuffer.cpp
+++ b/src/gpu/vk/GrVkBuffer.cpp
@@ -153,7 +153,7 @@ void GrVkBuffer::vkUnmap(GrVkGpu* gpu) {
         VK_CALL(gpu, UnmapMemory(gpu->device(), this->alloc().fMemory));
     } else {
         gpu->updateBuffer(this, fMapPtr, this->size());
-        delete fMapPtr;
+        delete (unsigned char*) fMapPtr;
     }
 
     fMapPtr = nullptr;