diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
index 9cff9e0..4e704bf 100644
--- a/Modules/mathmodule.c
+++ b/Modules/mathmodule.c
@@ -42,6 +42,27 @@
 
 #if defined(HAVE_HYPOT) && !defined(NeXT)
 extern double hypot PROTO((double, double));
+#else
+double hypot(x,y)
+	double x;
+	double y;
+{
+	double yx;
+
+	x = fabs(x);
+	y = fabs(y);
+	if (x < y) {
+		double temp = x;
+		x = y;
+		y = temp;
+	}
+	if (x == 0.)
+		return 0.;
+	else {
+		yx = y/x;
+		return x*sqrt(1.+yx*yx);
+	}
+}
 #endif
 
 #ifdef i860
@@ -124,9 +145,7 @@
 FUNC1(math_fabs, fabs)
 FUNC1(math_floor, floor)
 FUNC2(math_fmod, fmod)
-#ifdef HAVE_HYPOT
 FUNC2(math_hypot, hypot)
-#endif
 FUNC1(math_log, log)
 FUNC1(math_log10, log10)
 #ifdef MPW_3_1 /* This hack is needed for MPW 3.1 but not for 3.2 ... */
@@ -213,9 +232,7 @@
 	{"floor", math_floor},
 	{"fmod", math_fmod},
 	{"frexp", math_frexp},
-#ifdef HAVE_HYPOT
 	{"hypot", math_hypot},
-#endif
 	{"ldexp", math_ldexp},
 	{"log", math_log},
 	{"log10", math_log10},