diff --git a/ChangeLog b/ChangeLog
index 404d99d67a..0c54b09e4c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,8 @@ Tue Mar 25 06:55:43 2015  Kazuki Tanaka  <gogotanaka@ruby-lang.org>
 	* complex.c (k_inexact_p, k_exact_zero_p): use k_exact_zero_p macro
 	  to remove k_inexact_p macro.
 
+	* complex.c (k_exact_one_p): remove unused macro k_exact_one_p.
+
 Tue Mar 24 22:23:33 2015  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
 
 	* doc/extention.rdoc: move from toplevel document and added extname.
diff --git a/complex.c b/complex.c
index fc1e270453..d1cb207c3d 100644
--- a/complex.c
+++ b/complex.c
@@ -267,7 +267,6 @@ k_complex_p(VALUE x)
 #define k_exact_p(x) (!k_float_p(x))
 
 #define k_exact_zero_p(x) (k_exact_p(x) && f_zero_p(x))
-#define k_exact_one_p(x) (k_exact_p(x) && f_one_p(x))
 
 #define get_dat1(x) \
     struct RComplex *dat;\