diff --git a/CHANGELOG b/CHANGELOG
index af4aac039..63823e87f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -4,6 +4,7 @@ Release 1.5.2 (2013-03-??)
 ==========================
 - fixed GH #57: poco-1.5.1: Doesn't compile for Android
 - added VoidEvent (by Arturo Castro)
+- fixed GH #80: NumberFormatter::append broken
 
 Release 1.5.1 (2013-01-11)
 ==========================
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index a6436f7fd..523a3cab1 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -30,6 +30,7 @@ Patrick White
 Mike Naquin
 Roger Meier
 Mathaus Mendel
+Arturo Castro
 
 --
 $Id$
diff --git a/Foundation/src/NumericString.cpp b/Foundation/src/NumericString.cpp
index f8806be5d..6609835a1 100644
--- a/Foundation/src/NumericString.cpp
+++ b/Foundation/src/NumericString.cpp
@@ -57,8 +57,19 @@ void pad(std::string& str, int precision, int width, char prefix = ' ', char dec
 	/// Alternative prefix (e.g. zero instead of space) can be supplied by caller.
 	/// Used only internally.
 {
-	std::string::size_type frac = str.length() - str.find(decSep) - 1;
-	if (precision && (frac < precision)) str.append(precision - frac, '0');
+	std::string::size_type decSepPos = str.find(decSep);
+	if (decSepPos == std::string::npos)
+	{
+		str.append(1, '.');
+		decSepPos = str.size() - 1;
+	}
+
+	std::string::size_type frac = str.length() - decSepPos - 1;
+	if (precision)
+	{
+		if (frac < precision) str.append(precision - frac, '0');
+		else if (frac > precision) str = str.substr(0, frac + precision);
+	}
 	if (width && (str.length() < width)) str.insert(str.begin(), width - str.length(), prefix);
 }
 
diff --git a/Foundation/testsuite/src/NumberFormatterTest.cpp b/Foundation/testsuite/src/NumberFormatterTest.cpp
index 16e69b8fa..1e87673f1 100644
--- a/Foundation/testsuite/src/NumberFormatterTest.cpp
+++ b/Foundation/testsuite/src/NumberFormatterTest.cpp
@@ -235,6 +235,55 @@ void NumberFormatterTest::testFormatFloat()
 }
 
 
+void NumberFormatterTest::testAppend()
+{
+	std::string s;
+	NumberFormatter::append(s, 123);
+	assert (s == "123");
+	s.erase();
+	NumberFormatter::append(s, 123, 4);
+	assert (s == " 123");
+	s.erase();
+	NumberFormatter::append0(s, 123, 5);
+	assert (s == "00123");
+	s.erase();
+	NumberFormatter::appendHex(s, 0xDEAD);
+	assert (s == "DEAD");
+	s.erase();
+	NumberFormatter::appendHex(s, 0xDEAD, 6);
+	assert (s == "00DEAD");
+	s.erase();
+	NumberFormatter::append(s, 123u);
+	assert (s == "123");
+	s.erase();
+	NumberFormatter::append(s, 123u, 4);
+	assert (s == " 123");
+	s.erase();
+	NumberFormatter::append0(s, 123u, 5);
+	assert (s == "00123");
+
+	
+	s.erase();
+	NumberFormatter::append(s, 123.4);
+	assert (s == "123.4");
+	s.erase();
+	NumberFormatter::append(s, 123.4567, 2);
+	assert (s == "123.45");
+	s.erase();
+	NumberFormatter::append(s, 123.4567, 10, 5);
+	assert (s == " 123.45670");
+	s.erase();
+	NumberFormatter::append(s, 123., 2);
+	assert (s == "123.00");
+	s.erase();
+	NumberFormatter::append(s, static_cast<double>(1234567), 2);
+	assert (s == "1234567.00");
+	s.erase();
+	NumberFormatter::append(s, 1234567, 10, 1);
+	assert (s == " 1234567.0");
+}
+
+
 void NumberFormatterTest::setUp()
 {
 }
@@ -254,6 +303,7 @@ CppUnit::Test* NumberFormatterTest::suite()
 	CppUnit_addTest(pSuite, NumberFormatterTest, testFormatBool);
 	CppUnit_addTest(pSuite, NumberFormatterTest, testFormatHex);
 	CppUnit_addTest(pSuite, NumberFormatterTest, testFormatFloat);
+	CppUnit_addTest(pSuite, NumberFormatterTest, testAppend);
 
 	return pSuite;
 }
diff --git a/Foundation/testsuite/src/NumberFormatterTest.h b/Foundation/testsuite/src/NumberFormatterTest.h
index eb58cd6a8..d9cabedf6 100644
--- a/Foundation/testsuite/src/NumberFormatterTest.h
+++ b/Foundation/testsuite/src/NumberFormatterTest.h
@@ -51,7 +51,8 @@ public:
 	void testFormatBool();
 	void testFormatHex();
 	void testFormatFloat();
-	
+	void testAppend();
+
 	void setUp();
 	void tearDown();