--- a/liboctave/Array-f.cc
+++ b/liboctave/Array-f.cc
@@ -27,7 +27,7 @@
 
 // Instantiate Arrays of float values.
 
-#include "lo-ieee.h"
+#include "lo-mappers.h"
 #include "Array.h"
 #include "Array.cc"
 #include "oct-locbuf.h"
@@ -40,19 +40,19 @@
 inline bool
 sort_isnan<float> (float x)
 {
-  return lo_ieee_isnan (x);
+  return xisnan (x);
 }
 
 static bool
 nan_ascending_compare (float x, float y)
 {
-  return lo_ieee_isnan (y) ? ! lo_ieee_isnan (x) : x < y;
+  return xisnan (y) ? ! xisnan (x) : x < y;
 }
 
 static bool
 nan_descending_compare (float x, float y)
 {
-  return lo_ieee_isnan (x) ? ! lo_ieee_isnan (y) : x > y;
+  return xisnan (x) ? ! xisnan (y) : x > y;
 }
 
 Array<float>::compare_fcn_type