diff --git a/renderdoc/driver/vulkan/vk_shader_feedback.cpp b/renderdoc/driver/vulkan/vk_shader_feedback.cpp
index fc45dfd36..87b4e9e9b 100644
--- a/renderdoc/driver/vulkan/vk_shader_feedback.cpp
+++ b/renderdoc/driver/vulkan/vk_shader_feedback.cpp
@@ -124,7 +124,7 @@ public:
     return ret;
   }
 
-  size_t get_size() override { return sizeof(size_t) == 8 ? get_uint64() : get_uint(); }
+  size_t get_size() override { return sizeof(size_t) == 8 ? (size_t)get_uint64() : get_uint(); }
 private:
   const uint32_t *m_Cur;
   const uint32_t *m_Start;