diff --git a/ext/math/mach.cpp b/ext/math/mach.cpp
index 00aed4894..7718be97a 100755
--- a/ext/math/mach.cpp
+++ b/ext/math/mach.cpp
@@ -52,5 +52,9 @@ long i1mach_(long *i)
 
 long i1mach(long *i) { return i1mach_(i); }
 
+long _i1mach_(long *i) {
+  return i1mach_(i);
+}
+
 }