diff --git a/dlls/powrprof/powrprof.c b/dlls/powrprof/powrprof.c
index a5897280fc9..7327fdfe41f 100644
--- a/dlls/powrprof/powrprof.c
+++ b/dlls/powrprof/powrprof.c
@@ -341,6 +341,7 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
          break;
       }
       case DLL_PROCESS_DETACH:
+         if (lpvReserved) break;
          CloseHandle(PPRegSemaphore);
          break;
     }