diff --git a/libmaxsi/Makefile b/libmaxsi/Makefile
index 36c8281f..26327335 100644
--- a/libmaxsi/Makefile
+++ b/libmaxsi/Makefile
@@ -77,6 +77,7 @@ errorprint.o \
 exit.o \
 _exit.o \
 _Exit.o \
+fabs.o \
 fchmod.o \
 fcntl.o \
 fstat.o \
diff --git a/libmaxsi/fabs.cpp b/libmaxsi/fabs.cpp
new file mode 100644
index 00000000..f4e6117a
--- /dev/null
+++ b/libmaxsi/fabs.cpp
@@ -0,0 +1,46 @@
+/*******************************************************************************
+
+	Copyright(C) Jonas 'Sortie' Termansen 2012.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	fabs.cpp
+	Absolute value of floating point numbers.
+
+*******************************************************************************/
+
+#include <math.h>
+
+extern "C" double fabs(double x)
+{
+	if ( x < 0.0f )
+		return -x;
+	return x;
+}
+
+extern "C" float fabsf(float x)
+{
+	if ( x < 0.0f )
+		return -x;
+	return x;
+}
+
+extern "C" long double fabsl(long double x)
+{
+	if ( x < 0.0f )
+		return -x;
+	return x;
+}
diff --git a/libmaxsi/include/math.h b/libmaxsi/include/math.h
index 54c9a415..9f130e2e 100644
--- a/libmaxsi/include/math.h
+++ b/libmaxsi/include/math.h
@@ -1,6 +1,6 @@
 /******************************************************************************
 
-	COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
+	Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
 
 	This file is part of LibMaxsi.
 
@@ -30,6 +30,9 @@
 __BEGIN_DECLS
 
 /* TODO: Actually comply with standards by declaring stuff here. */
+double fabs(double x);
+float fabsf(float x);
+long double fabsl(long double x);
 
 __END_DECLS