diff --git a/gmp-h.in b/gmp-h.in
index e8efcdc9..97cb1193 100644
--- a/gmp-h.in
+++ b/gmp-h.in
@@ -2465,7 +2465,7 @@ mpn_neg_n (mp_ptr __gmp_rp, mp_srcptr __gmp_up, mp_size_t __gmp_n)
       ++__gmp_up; ++__gmp_rp;
     }
 
-  *__gmp_rp = (- *__gmp_up) & GMP_NUMB_MASK;
+  *__gmp_rp = (- *(mp_limb_signed_t*)__gmp_up) & GMP_NUMB_MASK;
 
   if (--__gmp_n) /* Higher limbs get complemented. */
     mpn_com (++__gmp_rp, ++__gmp_up, __gmp_n);
diff --git a/msvc/vs17/mpir.sln b/msvc/vs17/mpir.sln
index 6b535a16..cc857bd5 100644
--- a/msvc/vs17/mpir.sln
+++ b/msvc/vs17/mpir.sln
@@ -1,6 +1,5 @@
-
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 17
+# Visual Studio 15
 VisualStudioVersion = 15.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "dll_mpir_skylake_avx", "dll_mpir_skylake_avx\dll_mpir_skylake_avx.vcxproj", "{F4D1BF1B-A4AF-4B25-839A-66BF59838326}"
@@ -29,44 +28,47 @@ Global
 		Release|x64 = Release|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{F4D1BF1B-A4AF-4B25-839A-66BF59838326}.Release|Win32.ActiveCfg = Release|Win32
-		{F4D1BF1B-A4AF-4B25-839A-66BF59838326}.Release|x64.ActiveCfg = Release|x64
-		{F4D1BF1B-A4AF-4B25-839A-66BF59838326}.Debug|Win32.ActiveCfg = Debug|Win32
+		{F4D1BF1B-A4AF-4B25-839A-66BF59838326}.Debug|Win32.ActiveCfg = Debug|x64
 		{F4D1BF1B-A4AF-4B25-839A-66BF59838326}.Debug|x64.ActiveCfg = Debug|x64
-		{9DE5D517-52BA-4344-8470-9C9CF7CFB17C}.Release|Win32.ActiveCfg = Release|Win32
-		{9DE5D517-52BA-4344-8470-9C9CF7CFB17C}.Release|x64.ActiveCfg = Release|x64
-		{9DE5D517-52BA-4344-8470-9C9CF7CFB17C}.Debug|Win32.ActiveCfg = Debug|Win32
+		{F4D1BF1B-A4AF-4B25-839A-66BF59838326}.Release|Win32.ActiveCfg = Release|x64
+		{F4D1BF1B-A4AF-4B25-839A-66BF59838326}.Release|x64.ActiveCfg = Release|x64
+		{9DE5D517-52BA-4344-8470-9C9CF7CFB17C}.Debug|Win32.ActiveCfg = Debug|x64
 		{9DE5D517-52BA-4344-8470-9C9CF7CFB17C}.Debug|x64.ActiveCfg = Debug|x64
-		{B265237A-08C6-4BC3-A582-2B480F27C987}.Release|Win32.ActiveCfg = Release|Win32
-		{B265237A-08C6-4BC3-A582-2B480F27C987}.Release|x64.ActiveCfg = Release|x64
+		{9DE5D517-52BA-4344-8470-9C9CF7CFB17C}.Release|Win32.ActiveCfg = Release|x64
+		{9DE5D517-52BA-4344-8470-9C9CF7CFB17C}.Release|x64.ActiveCfg = Release|x64
 		{B265237A-08C6-4BC3-A582-2B480F27C987}.Debug|Win32.ActiveCfg = Debug|Win32
 		{B265237A-08C6-4BC3-A582-2B480F27C987}.Debug|x64.ActiveCfg = Debug|x64
-		{C1DEEFFD-CA22-481B-9F4E-436709F9C6AE}.Release|Win32.ActiveCfg = Release|Win32
-		{C1DEEFFD-CA22-481B-9F4E-436709F9C6AE}.Release|x64.ActiveCfg = Release|x64
+		{B265237A-08C6-4BC3-A582-2B480F27C987}.Release|Win32.ActiveCfg = Release|Win32
+		{B265237A-08C6-4BC3-A582-2B480F27C987}.Release|x64.ActiveCfg = Release|x64
 		{C1DEEFFD-CA22-481B-9F4E-436709F9C6AE}.Debug|Win32.ActiveCfg = Debug|Win32
 		{C1DEEFFD-CA22-481B-9F4E-436709F9C6AE}.Debug|x64.ActiveCfg = Debug|x64
-		{2ACEC5D2-F039-4A7F-B9D6-0025BAFD667B}.Release|Win32.ActiveCfg = Release|Win32
-		{2ACEC5D2-F039-4A7F-B9D6-0025BAFD667B}.Release|x64.ActiveCfg = Release|x64
+		{C1DEEFFD-CA22-481B-9F4E-436709F9C6AE}.Release|Win32.ActiveCfg = Release|Win32
+		{C1DEEFFD-CA22-481B-9F4E-436709F9C6AE}.Release|x64.ActiveCfg = Release|x64
 		{2ACEC5D2-F039-4A7F-B9D6-0025BAFD667B}.Debug|Win32.ActiveCfg = Debug|Win32
 		{2ACEC5D2-F039-4A7F-B9D6-0025BAFD667B}.Debug|x64.ActiveCfg = Debug|x64
-		{EFF13755-28D8-46A9-A297-66ADC97E4FB4}.Release|Win32.ActiveCfg = Release|Win32
-		{EFF13755-28D8-46A9-A297-66ADC97E4FB4}.Release|x64.ActiveCfg = Release|x64
+		{2ACEC5D2-F039-4A7F-B9D6-0025BAFD667B}.Release|Win32.ActiveCfg = Release|Win32
+		{2ACEC5D2-F039-4A7F-B9D6-0025BAFD667B}.Release|x64.ActiveCfg = Release|x64
 		{EFF13755-28D8-46A9-A297-66ADC97E4FB4}.Debug|Win32.ActiveCfg = Debug|Win32
-		{EFF13755-28D8-46A9-A297-66ADC97E4FB4}.Debug|x64.ActiveCfg = Debug|x64
-		{E26AF320-AC81-4FFC-A45E-BCEF48B0202F}.Release|Win32.ActiveCfg = Release|Win32
-		{E26AF320-AC81-4FFC-A45E-BCEF48B0202F}.Release|x64.ActiveCfg = Release|x64
+		{EFF13755-28D8-46A9-A297-66ADC97E4FB4}.Debug|x64.ActiveCfg = Debug|Win32
+		{EFF13755-28D8-46A9-A297-66ADC97E4FB4}.Release|Win32.ActiveCfg = Release|Win32
+		{EFF13755-28D8-46A9-A297-66ADC97E4FB4}.Release|x64.ActiveCfg = Release|Win32
 		{E26AF320-AC81-4FFC-A45E-BCEF48B0202F}.Debug|Win32.ActiveCfg = Debug|Win32
-		{E26AF320-AC81-4FFC-A45E-BCEF48B0202F}.Debug|x64.ActiveCfg = Debug|x64
-		{2577DCD8-678C-4A64-BCD4-57F0D18D4890}.Release|Win32.ActiveCfg = Release|Win32
-		{2577DCD8-678C-4A64-BCD4-57F0D18D4890}.Release|x64.ActiveCfg = Release|x64
-		{2577DCD8-678C-4A64-BCD4-57F0D18D4890}.Debug|Win32.ActiveCfg = Debug|Win32
+		{E26AF320-AC81-4FFC-A45E-BCEF48B0202F}.Debug|x64.ActiveCfg = Debug|Win32
+		{E26AF320-AC81-4FFC-A45E-BCEF48B0202F}.Release|Win32.ActiveCfg = Release|Win32
+		{E26AF320-AC81-4FFC-A45E-BCEF48B0202F}.Release|x64.ActiveCfg = Release|Win32
+		{2577DCD8-678C-4A64-BCD4-57F0D18D4890}.Debug|Win32.ActiveCfg = Debug|x64
 		{2577DCD8-678C-4A64-BCD4-57F0D18D4890}.Debug|x64.ActiveCfg = Debug|x64
-		{1ABCE2FD-FAE8-4143-9A46-F54FD3E93E6E}.Release|Win32.ActiveCfg = Release|Win32
-		{1ABCE2FD-FAE8-4143-9A46-F54FD3E93E6E}.Release|x64.ActiveCfg = Release|x64
-		{1ABCE2FD-FAE8-4143-9A46-F54FD3E93E6E}.Debug|Win32.ActiveCfg = Debug|Win32
+		{2577DCD8-678C-4A64-BCD4-57F0D18D4890}.Release|Win32.ActiveCfg = Release|x64
+		{2577DCD8-678C-4A64-BCD4-57F0D18D4890}.Release|x64.ActiveCfg = Release|x64
+		{1ABCE2FD-FAE8-4143-9A46-F54FD3E93E6E}.Debug|Win32.ActiveCfg = Debug|x64
 		{1ABCE2FD-FAE8-4143-9A46-F54FD3E93E6E}.Debug|x64.ActiveCfg = Debug|x64
+		{1ABCE2FD-FAE8-4143-9A46-F54FD3E93E6E}.Release|Win32.ActiveCfg = Release|x64
+		{1ABCE2FD-FAE8-4143-9A46-F54FD3E93E6E}.Release|x64.ActiveCfg = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {F1571729-8239-405F-8B06-0F3FE5F50850}
+	EndGlobalSection
 EndGlobal