--- a/liboctave/lo-ieee.h
+++ b/liboctave/lo-ieee.h
@@ -24,7 +24,7 @@
 #if !defined (octave_liboctave_ieee_h)
 #define octave_liboctave_ieee_h 1
 
-#ifdef	__cplusplus
+#ifdef  __cplusplus
 extern "C" {
 #endif
 
@@ -111,23 +111,23 @@
 
 extern OCTAVE_API int __lo_ieee_float_signbit (float);
 
-#ifdef	__cplusplus
+#ifdef  __cplusplus
 }
 #endif
 
 #define lo_ieee_isnan(x) (sizeof (x) == sizeof (float) ? \
-			 __lo_ieee_float_isnan (x) : __lo_ieee_isnan (x))
+                         __lo_ieee_float_isnan (x) : __lo_ieee_isnan (x))
 #define lo_ieee_finite(x) (sizeof (x) == sizeof (float) ? \
-			   __lo_ieee_float_finite (x) : __lo_ieee_finite (x))
+                           __lo_ieee_float_finite (x) : __lo_ieee_finite (x))
 #define lo_ieee_isinf(x) (sizeof (x) == sizeof (float) ? \
-			  __lo_ieee_float_isinf (x) : __lo_ieee_isinf (x))
+                          __lo_ieee_float_isinf (x) : __lo_ieee_isinf (x))
 
 
 #define lo_ieee_is_NA(x) (sizeof (x) == sizeof (float) ? \
-			  __lo_ieee_float_is_NA (x) : __lo_ieee_is_NA (x))
+                          __lo_ieee_float_is_NA (x) : __lo_ieee_is_NA (x))
 #define lo_ieee_is_NaN_or_NA(x) (sizeof (x) == sizeof (float) ? \
-			  __lo_ieee_float_is_NaN_or_NA (x) : __lo_ieee_is_NaN_or_NA (x))
+                          __lo_ieee_float_is_NaN_or_NA (x) : __lo_ieee_is_NaN_or_NA (x))
 #define lo_ieee_signbit(x) (sizeof (x) == sizeof (float) ? \
-			  __lo_ieee_float_signbit (x) : __lo_ieee_signbit (x))
+                          __lo_ieee_float_signbit (x) : __lo_ieee_signbit (x))
 
 #endif