diff --git a/dlls/ntdll/critsection.c b/dlls/ntdll/critsection.c
index 17bc6ceab3a..3fd54ddfcbb 100644
--- a/dlls/ntdll/critsection.c
+++ b/dlls/ntdll/critsection.c
@@ -74,18 +74,22 @@ static inline HANDLE get_semaphore( RTL_CRITICAL_SECTION *crit )
  */
 NTSTATUS WINAPI RtlInitializeCriticalSection( RTL_CRITICAL_SECTION *crit )
 {
-    crit->DebugInfo      = RtlAllocateHeap(ntdll_get_process_heap(), 0, sizeof(CRITICAL_SECTION_DEBUG));
-    if (crit->DebugInfo)
+    if (!ntdll_get_process_heap()) crit->DebugInfo = NULL;
+    else
     {
-        crit->DebugInfo->Type = 0;
-        crit->DebugInfo->CreatorBackTraceIndex = 0;
-        crit->DebugInfo->CriticalSection = crit;
-        crit->DebugInfo->ProcessLocksList.Blink = &(crit->DebugInfo->ProcessLocksList);
-        crit->DebugInfo->ProcessLocksList.Flink = &(crit->DebugInfo->ProcessLocksList);
-        crit->DebugInfo->EntryCount = 0;
-        crit->DebugInfo->ContentionCount = 0;
-        crit->DebugInfo->Spare[0] = 0;
-        crit->DebugInfo->Spare[1] = 0;
+        crit->DebugInfo = RtlAllocateHeap(ntdll_get_process_heap(), 0, sizeof(CRITICAL_SECTION_DEBUG));
+        if (crit->DebugInfo)
+        {
+            crit->DebugInfo->Type = 0;
+            crit->DebugInfo->CreatorBackTraceIndex = 0;
+            crit->DebugInfo->CriticalSection = crit;
+            crit->DebugInfo->ProcessLocksList.Blink = &(crit->DebugInfo->ProcessLocksList);
+            crit->DebugInfo->ProcessLocksList.Flink = &(crit->DebugInfo->ProcessLocksList);
+            crit->DebugInfo->EntryCount = 0;
+            crit->DebugInfo->ContentionCount = 0;
+            crit->DebugInfo->Spare[0] = 0;
+            crit->DebugInfo->Spare[1] = 0;
+        }
     }
     crit->LockCount      = -1;
     crit->RecursionCount = 0;