diff --git a/src/main.c b/src/main.c
index cab0719..810cb78 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1496,7 +1496,7 @@ HRESULT __stdcall ddraw_QueryInterface(IDirectDrawImpl *This, REFIID riid, void
 
     if (riid && !IsEqualGUID(&IID_IDirectDraw, riid))
     {
-        printf("  IID_IDirectDrawX\n");
+        printf("  GUID = %08X\n", ((GUID *)riid)->Data1);
 
         ddraw_AddRef(This);
         *obj = This;
diff --git a/src/surface.c b/src/surface.c
index f83f5f6..bbc8a89 100644
--- a/src/surface.c
+++ b/src/surface.c
@@ -36,7 +36,7 @@ HRESULT __stdcall ddraw_surface_QueryInterface(IDirectDrawSurfaceImpl *This, REF
 
     if (riid && !IsEqualGUID(&IID_IDirectDrawSurface, riid))
     {
-        printf("  IID_IDirectDrawSurfaceX\n");
+        printf("  GUID = %08X\n", ((GUID *)riid)->Data1);
 
         IDirectDrawSurface_AddRef(This);
     }