diff --git a/renderdoc/driver/vulkan/vk_serialise.cpp b/renderdoc/driver/vulkan/vk_serialise.cpp
index fb3465647..992c588a9 100644
--- a/renderdoc/driver/vulkan/vk_serialise.cpp
+++ b/renderdoc/driver/vulkan/vk_serialise.cpp
@@ -2487,7 +2487,8 @@ void DoSerialise(SerialiserType &ser, VkSpecializationMapEntry &el)
 {
   SERIALISE_MEMBER(constantID);
   SERIALISE_MEMBER(offset);
-  SERIALISE_MEMBER(constantID);
+  // this was accidentally duplicated - hide it from the UI
+  SERIALISE_MEMBER(constantID).Hidden();
 
   // don't serialise size_t, otherwise capture/replay between different bit-ness won't work
   {