diff --git a/renderdoc/driver/vulkan/vk_overlay.cpp b/renderdoc/driver/vulkan/vk_overlay.cpp
index 468f5ee92..49a93eef9 100644
--- a/renderdoc/driver/vulkan/vk_overlay.cpp
+++ b/renderdoc/driver/vulkan/vk_overlay.cpp
@@ -624,7 +624,7 @@ void VulkanDebugManager::PatchLineStripIndexBuffer(const ActionDescription *acti
     }
 
     if(rs.ibuffer.buf == ResourceId())
-      indices.resize(readSizeBytes);
+      indices.resize((size_t)readSizeBytes);
     else
       GetBufferData(rs.ibuffer.buf,
                     rs.ibuffer.offs + uint64_t(action->indexOffset) * rs.ibuffer.bytewidth,
diff --git a/renderdoc/driver/vulkan/vk_postvs.cpp b/renderdoc/driver/vulkan/vk_postvs.cpp
index 2d3693e8e..b3156850e 100644
--- a/renderdoc/driver/vulkan/vk_postvs.cpp
+++ b/renderdoc/driver/vulkan/vk_postvs.cpp
@@ -4367,7 +4367,7 @@ void VulkanReplay::FetchVSOut(uint32_t eventId, VulkanRenderState &state)
         GetBufferData(state.ibuffer.buf, state.ibuffer.offs + action->indexOffset * idxsize,
                       readSizeBytes, idxdata);
       else if(m_pDriver->Maintenance6())
-        idxdata.resize(readSizeBytes);
+        idxdata.resize((size_t)readSizeBytes);
     }
 
     // figure out what the maximum index could be, so we can clamp our index buffer to something