diff --git a/renderdoc/driver/vulkan/vk_postvs.cpp b/renderdoc/driver/vulkan/vk_postvs.cpp
index 25baa4a16..1eab4e291 100644
--- a/renderdoc/driver/vulkan/vk_postvs.cpp
+++ b/renderdoc/driver/vulkan/vk_postvs.cpp
@@ -1500,7 +1500,7 @@ void VulkanReplay::FetchVSOut(uint32_t eventId, VulkanRenderState &state)
     if(refl->inputSignature[i].regIndex >= MeshOutputBufferArraySize)
     {
       RDCERR("Input %s refers to attribute %u which is out of our array size %u",
-             refl->inputSignature[i].varName, refl->inputSignature[i].regIndex,
+             refl->inputSignature[i].varName.c_str(), refl->inputSignature[i].regIndex,
              MeshOutputBufferArraySize);
       return;
     }