diff --git a/src/Vulkan/VkShaderModule.cpp b/src/Vulkan/VkShaderModule.cpp
index b48c909..ce5e831 100644
--- a/src/Vulkan/VkShaderModule.cpp
+++ b/src/Vulkan/VkShaderModule.cpp
@@ -19,7 +19,10 @@
 namespace vk
 {
 
-ShaderModule::ShaderModule(const VkShaderModuleCreateInfo* pCreateInfo, void* mem) : code(reinterpret_cast<uint32_t*>(mem))
+std::atomic<uint32_t> ShaderModule::serialCounter(1);    // Start at 1, 0 is invalid shader.
+
+ShaderModule::ShaderModule(const VkShaderModuleCreateInfo* pCreateInfo, void* mem)
+	: serialID(nextSerialID()), code(reinterpret_cast<uint32_t*>(mem))
 {
 	memcpy(code, pCreateInfo->pCode, pCreateInfo->codeSize);
 	wordCount = static_cast<uint32_t>(pCreateInfo->codeSize / sizeof(uint32_t));