diff --git a/data_from_portwine/scripts/vars b/data_from_portwine/scripts/vars
index 9c95fee..1b11516 100755
--- a/data_from_portwine/scripts/vars
+++ b/data_from_portwine/scripts/vars
@@ -41,6 +41,7 @@ else        ###DXVK###
     export PROTON_NO_D3D11=0
     export PROTON_NO_D3D10=0
     export PROTON_OLD_GL_STRING=0
+    export DXVK_ASYNC=0
 #   export RADV_PERFTEST=aco
 #   export MESA_LOADER_DRIVER_OVERRIDE=zink
 fi