diff --git a/dlls/dplayx/dplay.c b/dlls/dplayx/dplay.c
index 9b287001e9e..d2d9c5f6a4a 100644
--- a/dlls/dplayx/dplay.c
+++ b/dlls/dplayx/dplay.c
@@ -5675,7 +5675,7 @@ HRESULT dplay_create( REFIID riid, void **ppv )
     obj->ref4A = 0;
     obj->ref4 = 1;
 
-    InitializeCriticalSection( &obj->lock );
+    InitializeCriticalSectionEx( &obj->lock, 0, RTL_CRITICAL_SECTION_FLAG_FORCE_DEBUG_INFO );
     obj->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": IDirectPlayImpl.lock");
 
     if ( DP_CreateDirectPlay2( obj ) )
diff --git a/dlls/dplayx/dplobby.c b/dlls/dplayx/dplobby.c
index aa2d44430f6..f7178597a9b 100644
--- a/dlls/dplayx/dplobby.c
+++ b/dlls/dplayx/dplobby.c
@@ -2043,7 +2043,7 @@ HRESULT dplobby_create( REFIID riid, void **ppv )
     obj->ref3 = 1;
     obj->ref3A = 0;
 
-    InitializeCriticalSection( &obj->lock );
+    InitializeCriticalSectionEx( &obj->lock, 0, RTL_CRITICAL_SECTION_FLAG_FORCE_DEBUG_INFO );
     obj->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": IDirectPlayLobbyImpl.lock");
     DPQ_INIT( obj->msgs );