diff --git a/rostests/dxtest/ddraw/tests/CreateDDraw.cpp b/rostests/dxtest/ddraw/tests/CreateDDraw.cpp
index 1cfdc176809..ec7a71cb6b3 100644
--- a/rostests/dxtest/ddraw/tests/CreateDDraw.cpp
+++ b/rostests/dxtest/ddraw/tests/CreateDDraw.cpp
@@ -119,12 +119,12 @@ BOOL Test_GetFourCCCodes (INT* passed, INT* failed)
 
 	/* Here we go */
 	DWORD dwNumCodes, *lpCodes;
-	TEST (DirectDraw->GetFourCCCodes(NULL, NULL) == DDERR_INVALIDPARAMS);
-	TEST ( DirectDraw->GetFourCCCodes(NULL, lpCodes) == DDERR_INVALIDPARAMS );
+	TEST (DirectDraw->GetFourCCCodes(NULL, (PDWORD)0xdeadbeef) == DDERR_INVALIDPARAMS);
 
 	TEST (DirectDraw->GetFourCCCodes(&dwNumCodes, NULL) == DD_OK && dwNumCodes);
 	lpCodes = (PDWORD)HeapAlloc(GetProcessHeap(), 0, sizeof(DWORD)*dwNumCodes);
 	*lpCodes = 0;
+	TEST ( DirectDraw->GetFourCCCodes(NULL, lpCodes) == DDERR_INVALIDPARAMS );
 	TEST (DirectDraw->GetFourCCCodes(&dwNumCodes, lpCodes) == DD_OK && *lpCodes );
 
 	DirectDraw->Release();
diff --git a/rostests/dxtest/ddraw/tests/CreateSurface.cpp b/rostests/dxtest/ddraw/tests/CreateSurface.cpp
index 6d8e0bc65ba..af5de3eff18 100644
--- a/rostests/dxtest/ddraw/tests/CreateSurface.cpp
+++ b/rostests/dxtest/ddraw/tests/CreateSurface.cpp
@@ -22,7 +22,7 @@ BOOL Test_CreateSurface (INT* passed, INT* failed)
  
 	if (DirectDraw->SetCooperativeLevel (hwnd, DDSCL_NORMAL) != DD_OK)
 	{
-		printf("ERROR: you not set cooperative level\n");
+		printf("ERROR: Could not set cooperative level\n");
 		DirectDraw->Release();
 		return 0;
 	}
@@ -207,4 +207,4 @@ BOOL Test_CreateSurface (INT* passed, INT* failed)
 	DirectDraw->Release();
  
 	return TRUE;
-}
\ No newline at end of file
+}