diff --git a/renderdoc/driver/vulkan/vk_core.cpp b/renderdoc/driver/vulkan/vk_core.cpp
index 73e0bcc8c..ef1d39aab 100644
--- a/renderdoc/driver/vulkan/vk_core.cpp
+++ b/renderdoc/driver/vulkan/vk_core.cpp
@@ -306,7 +306,7 @@ WrappedVulkan::WrappedVulkan(const char *logFilename) : m_RenderState(&m_Creatio
   m_Queue = VK_NULL_HANDLE;
   m_QueueFamilyIdx = 0;
   m_SupportedQueueFamily = 0;
-  m_DbgMsgCallback = NULL;
+  m_DbgMsgCallback = VK_NULL_HANDLE;
 
   m_HeaderChunk = NULL;