diff --git a/renderdoc/driver/vulkan/vk_next_chains.cpp b/renderdoc/driver/vulkan/vk_next_chains.cpp
index c3d435efa..1cf274bdf 100644
--- a/renderdoc/driver/vulkan/vk_next_chains.cpp
+++ b/renderdoc/driver/vulkan/vk_next_chains.cpp
@@ -792,7 +792,7 @@ size_t GetNextPatchSize(const void *pNext)
 
       case VK_STRUCTURE_TYPE_RANGE_SIZE:
       case VK_STRUCTURE_TYPE_MAX_ENUM:
-        RDCERR("Invalid value %x in pNext chain", next->sType);
+        RDCERR("Invalid value %u in pNext chain", next->sType);
         break;
     }
 
diff --git a/renderdoc/driver/vulkan/vk_serialise.cpp b/renderdoc/driver/vulkan/vk_serialise.cpp
index 60660ab76..bb5d6c545 100644
--- a/renderdoc/driver/vulkan/vk_serialise.cpp
+++ b/renderdoc/driver/vulkan/vk_serialise.cpp
@@ -1082,7 +1082,7 @@ static void SerialiseNext(SerialiserType &ser, VkStructureType &sType, const voi
     }
 
     if(!handled)
-      RDCERR("Invalid next structure sType: %x", *nextType);
+      RDCERR("Invalid next structure sType: %u", *nextType);
 
     // delete the type itself. Any pNext we serialised is saved in the pNext pointer and will be
     // deleted in DeserialiseNext()
@@ -1134,7 +1134,7 @@ static void SerialiseNext(SerialiserType &ser, VkStructureType &sType, const voi
       }
 
       if(!handled)
-        RDCERR("Invalid pNext structure sType: %x", next->sType);
+        RDCERR("Invalid pNext structure sType: %u", next->sType);
 
       // walk to the next item if we didn't serialise the current one
       next = (VkBaseInStructure *)next->pNext;