diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index fc71ebe..7a7f36d 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -22,12 +22,15 @@ sub _new
 		VisualStudioVersion        => undef,
 		MinimumVisualStudioVersion => undef,
 		vcver                      => undef,
-		platform                   => undef, };
+		platform                   => undef,
+		ICUVersion                 => undef, };
 	bless($self, $classname);
 
 	$self->DeterminePlatform();
 	my $bits = $self->{platform} eq 'Win32' ? 32 : 64;
 
+	$self->DetermineICUVersion();
+
 	$options->{float4byval} = 1
 	  unless exists $options->{float4byval};
 	$options->{float8byval} = ($bits == 64)
@@ -76,6 +79,19 @@ sub DeterminePlatform
 	print "Detected hardware platform: $self->{platform}\n";
 }
 
+sub DetermineICUVersion{
+
+	my $self = shift;
+
+	# get the icu version.
+	my $output = `uconv -V /? 2>&1`;
+	$? >> 8 == 0 or die "uconv command not found";
+
+	$output =~ /(\d+)\.(\d+)?$/m;
+	$self->{ICUVersion} = $1;
+	print "Detected icu version : $self->{ICUVersion}\n";
+}
+
 # Return 1 if $oldfile is newer than $newfile, or if $newfile doesn't exist.
 # Special case - if config.pl has changed, always return 1
 sub IsNewer
@@ -223,6 +239,8 @@ s{PG_VERSION_STR "[^"]+"}{PG_VERSION_STR "PostgreSQL $self->{strver}$extraver, c
 		if ($self->{options}->{icu})
 		{
 			print $o "#define USE_ICU 1\n";
+			print $o "#define HAVE_UCOL_STRCOLLUTF8 1\n"
+			if ($self->{ICUVersion} >= 50);
 		}
 		if (my $port = $self->{options}->{"--with-pgport"})
 		{