diff --git a/dlls/dbghelp/dbghelp.c b/dlls/dbghelp/dbghelp.c
index 9d33bc67f2b..e38687412eb 100644
--- a/dlls/dbghelp/dbghelp.c
+++ b/dlls/dbghelp/dbghelp.c
@@ -304,14 +304,14 @@ static BOOL check_live_target(struct process* pcs)
         PEB32 peb32;
         C_ASSERT(sizeof(void*) != 4 || FIELD_OFFSET(RTL_USER_PROCESS_PARAMETERS, Environment) == 0x48);
         if (!ReadProcessMemory(pcs->handle, pbi.PebBaseAddress, &peb32, sizeof(peb32), NULL)) return FALSE;
-        base = peb32.Reserved[0];
+        if (!ReadProcessMemory(pcs->handle, (char *)pbi.PebBaseAddress + 0x460 /* CloudFileFlags */, &base, sizeof(base), NULL)) return FALSE;
         if (read_process_memory(pcs, peb32.ProcessParameters + 0x48, &env32, sizeof(env32))) env = env32;
     }
     else
     {
         PEB peb;
         if (!ReadProcessMemory(pcs->handle, pbi.PebBaseAddress, &peb, sizeof(peb), NULL)) return FALSE;
-        base = peb.Reserved[0];
+        if (!ReadProcessMemory(pcs->handle, &peb.CloudFileFlags, &base, sizeof(base), NULL)) return FALSE;
         ReadProcessMemory(pcs->handle, &peb.ProcessParameters->Environment, &env, sizeof(env), NULL);
     }
 
diff --git a/dlls/ntdll/unix/virtual.c b/dlls/ntdll/unix/virtual.c
index 614159b7d90..853eb0469b9 100644
--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -2591,7 +2591,7 @@ TEB *virtual_alloc_first_teb(void)
     NtAllocateVirtualMemory( NtCurrentProcess(), (void **)&ptr, 0, &block_size, MEM_COMMIT, PAGE_READWRITE );
     NtAllocateVirtualMemory( NtCurrentProcess(), (void **)&peb, 0, &peb_size, MEM_COMMIT, PAGE_READWRITE );
     init_teb( teb, peb );
-    *(ULONG_PTR *)peb->Reserved = get_image_address();
+    *(ULONG_PTR *)&peb->CloudFileFlags = get_image_address();
     return teb;
 }