diff --git a/include/math.h b/include/math.h
index 8efaab15c..81778e429 100644
--- a/include/math.h
+++ b/include/math.h
@@ -24,6 +24,7 @@ _PROTOTYPE( double cos,   (double _x)					);
 _PROTOTYPE( double cosh,  (double _x)					);
 _PROTOTYPE( double exp,   (double _x)					);
 _PROTOTYPE( double fabs,  (double _x)					);
+_PROTOTYPE( double fabsf, (float _x)					);
 _PROTOTYPE( double floor, (double _x)					);
 _PROTOTYPE( double fmod,  (double _x, double _y)			);
 _PROTOTYPE( double frexp, (double _x, int *_exp)			);
diff --git a/lib/math/fabs.c b/lib/math/fabs.c
index 8c190c2c6..3cb12385f 100644
--- a/lib/math/fabs.c
+++ b/lib/math/fabs.c
@@ -6,8 +6,15 @@
  */
 /* $Header$ */
 
+float
+fabsf(float x)
+{
+	return  x < 0 ? -x : x;
+}
+
 double
 fabs(double x)
 {
 	return  x < 0 ? -x : x;
 }
+
diff --git a/man/man3/fabs.3 b/man/man3/fabs.3
new file mode 100644
index 000000000..bf90ea5ed
--- /dev/null
+++ b/man/man3/fabs.3
@@ -0,0 +1,18 @@
+.TH FABS 3 "January 7, 2009"
+.UC 4
+.SH NAME
+fabs, fabsf \- compute absolute value
+.SH SYNOPSIS
+.nf
+.ft B
+#include <math.h>
+
+double fabs(double \fIx\fP);
+float fabsf(float \fIx\fP);
+.fi
+.SH DESCRIPTION
+\fBfabs\fP and \fBfabsf\fP return the absolute value of their argument.
+.SH "RETURN VALUE
+The return value is a number with the same magnitude as the argument and with
+a positive sign.
+