diff --git a/include/vulkan.h b/include/vulkan.h
index 5ea8e60..b067b83 100644
--- a/include/vulkan.h
+++ b/include/vulkan.h
@@ -2149,8 +2149,7 @@
 typedef void (VKAPI *PFN_vkDestroyShader)(VkDevice device, VkShader shader);
 typedef VkResult (VKAPI *PFN_vkCreatePipelineCache)(VkDevice device, const VkPipelineCacheCreateInfo* pCreateInfo, VkPipelineCache* pPipelineCache);
 typedef void (VKAPI *PFN_vkDestroyPipelineCache)(VkDevice device, VkPipelineCache pipelineCache);
-typedef size_t (VKAPI *PFN_vkGetPipelineCacheSize)(VkDevice device, VkPipelineCache pipelineCache);
-typedef VkResult (VKAPI *PFN_vkGetPipelineCacheData)(VkDevice device, VkPipelineCache pipelineCache, size_t dataSize, void* pData);
+typedef VkResult (VKAPI *PFN_vkGetPipelineCacheData)(VkDevice device, VkPipelineCache pipelineCache, size_t* pDataSize, void* pData);
 typedef VkResult (VKAPI *PFN_vkMergePipelineCaches)(VkDevice device, VkPipelineCache destCache, uint32_t srcCacheCount, const VkPipelineCache* pSrcCaches);
 typedef VkResult (VKAPI *PFN_vkCreateGraphicsPipelines)(VkDevice device, VkPipelineCache pipelineCache, uint32_t count, const VkGraphicsPipelineCreateInfo* pCreateInfos, VkPipeline* pPipelines);
 typedef VkResult (VKAPI *PFN_vkCreateComputePipelines)(VkDevice device, VkPipelineCache pipelineCache, uint32_t count, const VkComputePipelineCreateInfo* pCreateInfos, VkPipeline* pPipelines);
@@ -2566,14 +2565,10 @@
     VkDevice                                    device,
     VkPipelineCache                             pipelineCache);
 
-size_t VKAPI vkGetPipelineCacheSize(
-    VkDevice                                    device,
-    VkPipelineCache                             pipelineCache);
-
 VkResult VKAPI vkGetPipelineCacheData(
     VkDevice                                    device,
     VkPipelineCache                             pipelineCache,
-    size_t                                      dataSize,
+    size_t*                                     pDataSize,
     void*                                       pData);
 
 VkResult VKAPI vkMergePipelineCaches(