diff --git a/devicemodel/hw/pci/passthrough.c b/devicemodel/hw/pci/passthrough.c
index ec638d436..4c7597b53 100644
--- a/devicemodel/hw/pci/passthrough.c
+++ b/devicemodel/hw/pci/passthrough.c
@@ -60,8 +60,8 @@
 
 extern uint64_t audio_nhlt_len;
 
-uint32_t gpu_dsm_hpa = 0;
-uint32_t gpu_dsm_gpa = 0;
+uint64_t gpu_dsm_hpa = 0;
+uint64_t gpu_dsm_gpa = 0;
 uint32_t gpu_opregion_hpa = 0;
 uint32_t gpu_opregion_gpa = 0;