diff --git a/src/libFLAC/lpc.c b/src/libFLAC/lpc.c
index 2e36df53..4af516dd 100644
--- a/src/libFLAC/lpc.c
+++ b/src/libFLAC/lpc.c
@@ -216,7 +216,13 @@ void FLAC__lpc_compute_residual_from_qlp_coefficients(const FLAC__int32 data[],
 			sum += qlp_coeff[j] * (*(--history));
 #ifdef FLAC__OVERFLOW_DETECT
 			sumo += (FLAC__int64)qlp_coeff[j] * (FLAC__int64)(*history);
-			if(sumo > 2147483647ll || sumo < -2147483648ll) {
+#ifdef _MSC_VER /* don't know how to do 64-bit literals in VC++ */
+			if(sumo < 0) sumo = -sumo;
+			if(sumo > 2147483647)
+#else
+			if(sumo > 2147483647ll || sumo < -2147483648ll)
+#endif
+			{
 				fprintf(stderr,"FLAC__lpc_compute_residual_from_qlp_coefficients: OVERFLOW, i=%u, j=%u, c=%d, d=%d, sumo=%lld\n",i,j,qlp_coeff[j],*history,sumo);
 			}
 #endif
@@ -261,7 +267,13 @@ void FLAC__lpc_restore_signal(const FLAC__int32 residual[], unsigned data_len, c
 			sum += qlp_coeff[j] * (*(--history));
 #ifdef FLAC__OVERFLOW_DETECT
 			sumo += (FLAC__int64)qlp_coeff[j] * (FLAC__int64)(*history);
-			if(sumo > 2147483647ll || sumo < -2147483648ll) {
+#ifdef _MSC_VER /* don't know how to do 64-bit literals in VC++ */
+			if(sumo < 0) sumo = -sumo;
+			if(sumo > 2147483647)
+#else
+			if(sumo > 2147483647ll || sumo < -2147483648ll)
+#endif
+			{
 				fprintf(stderr,"FLAC__lpc_restore_signal: OVERFLOW, i=%u, j=%u, c=%d, d=%d, sumo=%lld\n",i,j,qlp_coeff[j],*history,sumo);
 			}
 #endif