diff --git a/libdnet-stripped/include/dnet/os.h b/libdnet-stripped/include/dnet/os.h
index 7fd2fad47..55a21b932 100644
--- a/libdnet-stripped/include/dnet/os.h
+++ b/libdnet-stripped/include/dnet/os.h
@@ -118,8 +118,8 @@
 #  if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
 #   define __flexarr	[]
 #  elif defined(_WIN32)
-/* MS VC++ */
-#   define __flexarr	[]
+/* MS VC++ -- using [] works but gives a "nonstandard extension" warning */
+#   define __flexarr	[1]
 #  else
 /* Some other non-C99 compiler. Approximate with [1]. */
 #   define __flexarr	[1]
diff --git a/libdnet-stripped/libdnet-stripped.vcproj b/libdnet-stripped/libdnet-stripped.vcproj
index fc43ea2f3..0198779d8 100755
--- a/libdnet-stripped/libdnet-stripped.vcproj
+++ b/libdnet-stripped/libdnet-stripped.vcproj
@@ -50,7 +50,6 @@
 				RuntimeLibrary="1"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="4"
 			/>
 			<Tool
@@ -113,7 +112,6 @@
 				RuntimeLibrary="2"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="3"
 			/>
 			<Tool
diff --git a/liblua/liblua.vcproj b/liblua/liblua.vcproj
index b4bd2d679..001ddf250 100644
--- a/liblua/liblua.vcproj
+++ b/liblua/liblua.vcproj
@@ -53,7 +53,6 @@
 				RuntimeTypeInfo="false"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="4"
 				CallingConvention="0"
 				CompileAs="1"
@@ -125,7 +124,6 @@
 				RuntimeTypeInfo="false"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="0"
 				CompileAs="1"
 			/>
diff --git a/libpcre/libpcre.vcproj b/libpcre/libpcre.vcproj
index 9b6a391ba..225032387 100644
--- a/libpcre/libpcre.vcproj
+++ b/libpcre/libpcre.vcproj
@@ -47,7 +47,6 @@
 				RuntimeLibrary="1"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="false"
 				DebugInformationFormat="4"
 				CompileAs="1"
 			/>
@@ -109,7 +108,6 @@
 				RuntimeLibrary="2"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="false"
 				DebugInformationFormat="3"
 				CompileAs="1"
 			/>
diff --git a/mswin32/nmap.vcproj b/mswin32/nmap.vcproj
index cf49f3b38..4548235cc 100644
--- a/mswin32/nmap.vcproj
+++ b/mswin32/nmap.vcproj
@@ -82,7 +82,7 @@
 				GenerateDebugInformation="true"
 				ProgramDatabaseFile=".\Debug/nmap.pdb"
 				SubSystem="1"
-				OptimizeForWindows98="1"
+				OptimizeForWindows98="0"
 				RandomizedBaseAddress="1"
 				DataExecutionPrevention="0"
 				TargetMachine="1"
diff --git a/output.cc b/output.cc
index 8cac5e4dd..af1a92fd9 100644
--- a/output.cc
+++ b/output.cc
@@ -1322,15 +1322,16 @@ static void write_xml_initial_hostinfo(Target *currenths,
 
 /* Convert a number to a string, keeping the given number of significant digits.
    The result is returned in a static buffer. */
-static char *num_to_string_sigdigits(double d, unsigned int digits) {
+static char *num_to_string_sigdigits(double d, int digits) {
   static char buf[32];
   int shift;
   int n;
 
+  assert(digits >= 0);
   if (d == 0.0) {
     shift = -digits;
   } else {
-    shift = floor(log10(fabs(d))) - digits + 1;
+    shift = (int) floor(log10(fabs(d))) - digits + 1;
     d = floor(d / pow(10.0, shift) + 0.5);
     d = d * pow(10.0, shift);
   }