diff --git a/pcsx2/GS/Renderers/DX12/GSDevice12.cpp b/pcsx2/GS/Renderers/DX12/GSDevice12.cpp
index e4c6972acf..89feb6191e 100644
--- a/pcsx2/GS/Renderers/DX12/GSDevice12.cpp
+++ b/pcsx2/GS/Renderers/DX12/GSDevice12.cpp
@@ -1401,6 +1401,7 @@ bool GSDevice12::CheckStagingBufferSize(u32 required_size)
 		return false;
 	}
 
+	m_readback_staging_buffer_size = required_size;
 	return true;
 }
 
diff --git a/pcsx2/GS/Renderers/Vulkan/GSDeviceVK.cpp b/pcsx2/GS/Renderers/Vulkan/GSDeviceVK.cpp
index 8139f94dab..be3f0e7505 100644
--- a/pcsx2/GS/Renderers/Vulkan/GSDeviceVK.cpp
+++ b/pcsx2/GS/Renderers/Vulkan/GSDeviceVK.cpp
@@ -1804,6 +1804,7 @@ bool GSDeviceVK::CheckStagingBufferSize(u32 required_size)
 	}
 
 	m_readback_staging_buffer_map = ai.pMappedData;
+	m_readback_staging_buffer_size = required_size;
 	return true;
 }