Index: build/test/test
==================================================================
--- build/test/test
+++ build/test/test
@@ -56,12 +56,12 @@
 "Auto"=dword:00000001
 "Debugger"="false"
 _EOF_
 cp "${WINEPREFIX32}/update-reg" "${WINEPREFIX64}/update-reg"
 
-regedit "${WINEPREFIX32}/update-reg" >/dev/null 2>/dev/null
-regedit "${WINEPREFIX64}/update-reg" >/dev/null 2>/dev/null
+WINEPREFIX="${WINEPREFIX32}" regedit "${WINEPREFIX32}/update-reg" >/dev/null 2>/dev/null
+WINEPREFIX="${WINEPREFIX64}" regedit "${WINEPREFIX64}/update-reg" >/dev/null 2>/dev/null
 
 # Start Xvfb for X11-based tests
 XVFB_PID="$(
 	Xvfb :31 -screen 0 800x600x24 -nolisten tcp >/dev/null 2>/dev/null &
 	echo "$!"