diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
index f4089f4..9cff9e0 100644
--- a/Modules/mathmodule.c
+++ b/Modules/mathmodule.c
@@ -40,7 +40,7 @@
 extern double modf PROTO((double, double *));
 #endif
 
-#ifdef HAVE_HYPOT
+#if defined(HAVE_HYPOT) && !defined(NeXT)
 extern double hypot PROTO((double, double));
 #endif