diff --git a/reactos/boot/bootdata/hivesys.inf b/reactos/boot/bootdata/hivesys.inf
index a3fa49474a1..5d50bc5ddbf 100644
--- a/reactos/boot/bootdata/hivesys.inf
+++ b/reactos/boot/bootdata/hivesys.inf
@@ -423,6 +423,8 @@ HKLM,"SYSTEM\CurrentControlSet\Control\Session Manager\Environment","windir",0x0
 HKLM,"SYSTEM\CurrentControlSet\Control\Session Manager\Environment","TEMP",0x00020000,"%SystemDrive%\TEMP"
 HKLM,"SYSTEM\CurrentControlSet\Control\Session Manager\Environment","TMP",0x00020000,"%SystemDrive%\TEMP"
 HKLM,"SYSTEM\CurrentControlSet\Control\Session Manager\Environment","PATHEXT",0x00020000,".COM;.EXE;.BAT;.CMD"
+HKLM,"SYSTEM\CurrentControlSet\Control\Session Manager\Environment","PROCESSOR_ARCHITECTURE",0x00020000,"x86"
+
 
 ; Known DLLs
 HKLM,"SYSTEM\CurrentControlSet\Control\Session Manager\KnownDlls","DllDirectory",0x00020000,"%SystemRoot%\system32"