diff --git a/renderdoc/driver/vulkan/vk_core.h b/renderdoc/driver/vulkan/vk_core.h
index 00bba02df..a207a483d 100644
--- a/renderdoc/driver/vulkan/vk_core.h
+++ b/renderdoc/driver/vulkan/vk_core.h
@@ -52,7 +52,7 @@ struct VkInitParams
   uint32_t GetSerialiseSize();
 
   // check if a frame capture section version is supported
-  static const uint64_t CurrentVersion = 0x7;
+  static const uint64_t CurrentVersion = 0x8;
   static bool IsSupportedVersion(uint64_t ver);
 };
 
diff --git a/renderdoc/driver/vulkan/wrappers/vk_resource_funcs.cpp b/renderdoc/driver/vulkan/wrappers/vk_resource_funcs.cpp
index 90dda9104..f1cfca669 100644
--- a/renderdoc/driver/vulkan/wrappers/vk_resource_funcs.cpp
+++ b/renderdoc/driver/vulkan/wrappers/vk_resource_funcs.cpp
@@ -597,6 +597,7 @@ bool WrappedVulkan::Serialise_vkUnmapMemory(SerialiserType &ser, VkDevice device
   }
 
   SERIALISE_ELEMENT(MapOffset);
+  SERIALISE_ELEMENT(MapSize);
 
   if(IsReplayingAndReading())
   {
@@ -721,8 +722,9 @@ bool WrappedVulkan::Serialise_vkFlushMappedMemoryRanges(SerialiserType &ser, VkD
 
   if(IsReplayingAndReading())
   {
-    VkResult ret = ObjDisp(device)->MapMemory(Unwrap(device), Unwrap(MemRange.memory),
-                                              MemRange.offset, memRangeSize, 0, (void **)&MappedData);
+    VkResult ret =
+        ObjDisp(device)->MapMemory(Unwrap(device), Unwrap(MemRange.memory), MemRange.offset,
+                                   MemRange.size, 0, (void **)&MappedData);
     if(ret != VK_SUCCESS)
       RDCERR("Error mapping memory on replay: %s", ToStr(ret).c_str());
   }