Index: lib/rtl/env.c
===================================================================
--- lib/rtl/env.c	(revision 69817)
+++ lib/rtl/env.c	(working copy)
@@ -524,6 +524,7 @@
    {
       PPEB Peb = RtlGetCurrentPeb();
       if (Peb) {
+          RtlAcquirePebLock();
           Environment = Peb->ProcessParameters->Environment;
           SysEnvUsed = TRUE;
       }
@@ -531,12 +532,12 @@
 
    if (Environment == NULL)
    {
+       if (SysEnvUsed)
+           RtlReleasePebLock();
       return(STATUS_VARIABLE_NOT_FOUND);
    }
 
    Value->Length = 0;
-   if (SysEnvUsed)
-      RtlAcquirePebLock();
 
    wcs = Environment;
    DPRINT("Starting search at :%p\n", wcs);