diff --git a/source/Lib/CommonLib/x86/InterpolationFilterX86.h b/source/Lib/CommonLib/x86/InterpolationFilterX86.h
index 91db72e9..52a31e5d 100644
--- a/source/Lib/CommonLib/x86/InterpolationFilterX86.h
+++ b/source/Lib/CommonLib/x86/InterpolationFilterX86.h
@@ -2997,7 +2997,13 @@ void simdFilter8xX_N4( const ClpRng& clpRng, const Pel* src, const ptrdiff_t src
 
     __m128i vsum, vsuma, vsumb;
 
+#ifdef NDEBUG
     __m128i vsrcv0, vsrcv1, vsrcv2, vsrcv3;
+#else
+    __m128i
+        vsrcv0 = _mm_setzero_si128(), vsrcv1 = _mm_setzero_si128(),
+        vsrcv2 = _mm_setzero_si128(), vsrcv3 = _mm_setzero_si128();
+#endif
 
     for( int row = 0; row < extHeight; row++ )
     {