diff --git a/reactos/lib/kernel32/misc/dllmain.c b/reactos/lib/kernel32/misc/dllmain.c
index f4d1544a562..0709797c5bc 100644
--- a/reactos/lib/kernel32/misc/dllmain.c
+++ b/reactos/lib/kernel32/misc/dllmain.c
@@ -348,6 +348,10 @@ DllMain(HANDLE hDll,
         SystemDirectory.Buffer = RtlAllocateHeap(hProcessHeap,
                                                  0,
                                                  SystemDirectory.MaximumLength);
+        if(SystemDirectory.Buffer == NULL)
+        {
+           return FALSE;
+        }
         wcscpy(SystemDirectory.Buffer, WindowsDirectory.Buffer);
         wcscat(SystemDirectory.Buffer, L"\\System32");