diff --git a/src/libFLAC/stream_encoder_intrin_avx2.c b/src/libFLAC/stream_encoder_intrin_avx2.c
index d0cd0e4..4730bf5 100644
--- a/src/libFLAC/stream_encoder_intrin_avx2.c
+++ b/src/libFLAC/stream_encoder_intrin_avx2.c
@@ -84,6 +84,10 @@ void FLAC__precompute_partition_info_sums_intrin_avx2(const FLAC__int32 residual
 				sum128 = _mm_hadd_epi32(sum128, sum128);
 				sum128 = _mm_hadd_epi32(sum128, sum128);
 				abs_residual_partition_sums[partition] = (FLAC__uint32)_mm_cvtsi128_si32(sum128);
+/* workaround for a bug in MSVC2015U2 - see https://connect.microsoft.com/VisualStudio/feedback/details/2659191/incorrect-code-generation-for-x86-64 */
+#if (defined _MSC_VER) && (_MSC_FULL_VER == 190023918) && (defined FLAC__CPU_X86_64)
+				abs_residual_partition_sums[partition] &= 0xFFFFFFFF; /**/
+#endif
 			}
 		}
 		else { /* have to pessimistically use 64 bits for accumulator */
diff --git a/src/libFLAC/stream_encoder_intrin_sse2.c b/src/libFLAC/stream_encoder_intrin_sse2.c
index ed01978..55f7664 100644
--- a/src/libFLAC/stream_encoder_intrin_sse2.c
+++ b/src/libFLAC/stream_encoder_intrin_sse2.c
@@ -98,6 +98,10 @@ void FLAC__precompute_partition_info_sums_intrin_sse2(const FLAC__int32 residual
 				mm_sum = _mm_add_epi32(mm_sum, _mm_srli_si128(mm_sum, 8));
 				mm_sum = _mm_add_epi32(mm_sum, _mm_srli_si128(mm_sum, 4));
 				abs_residual_partition_sums[partition] = (FLAC__uint32)_mm_cvtsi128_si32(mm_sum);
+/* workaround for a bug in MSVC2015U2 - see https://connect.microsoft.com/VisualStudio/feedback/details/2659191/incorrect-code-generation-for-x86-64 */
+#if (defined _MSC_VER) && (_MSC_FULL_VER == 190023918) && (defined FLAC__CPU_X86_64)
+				abs_residual_partition_sums[partition] &= 0xFFFFFFFF;
+#endif
 			}
 		}
 		else { /* have to pessimistically use 64 bits for accumulator */
diff --git a/src/libFLAC/stream_encoder_intrin_ssse3.c b/src/libFLAC/stream_encoder_intrin_ssse3.c
index 465950b..551ffd3 100644
--- a/src/libFLAC/stream_encoder_intrin_ssse3.c
+++ b/src/libFLAC/stream_encoder_intrin_ssse3.c
@@ -87,6 +87,10 @@ void FLAC__precompute_partition_info_sums_intrin_ssse3(const FLAC__int32 residua
 				mm_sum = _mm_hadd_epi32(mm_sum, mm_sum);
 				mm_sum = _mm_hadd_epi32(mm_sum, mm_sum);
 				abs_residual_partition_sums[partition] = (FLAC__uint32)_mm_cvtsi128_si32(mm_sum);
+/* workaround for a bug in MSVC2015U2 - see https://connect.microsoft.com/VisualStudio/feedback/details/2659191/incorrect-code-generation-for-x86-64 */
+#if (defined _MSC_VER) && (_MSC_FULL_VER == 190023918) && (defined FLAC__CPU_X86_64)
+				abs_residual_partition_sums[partition] &= 0xFFFFFFFF;
+#endif
 			}
 		}
 		else { /* have to pessimistically use 64 bits for accumulator */