diff --git a/ChangeLog b/ChangeLog
index 2f0d932439..669875cfd1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2013-10-13  Andrew Grimm  <andrew.j.grimm@gmail.com>
+
+	* vsnprintf.c: Fix spelling from compliment to complement.
+	  Patch by @agrimm.
+
+	* include/ruby/ruby.h: ditto
+
 2013-10-13  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* vm.c (Init_BareVM): initialize defined_module_hash here,
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index d0ba1c2df6..17f3a363dc 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -187,7 +187,7 @@ typedef char ruby_check_sizeof_voidp[SIZEOF_VOIDP == sizeof(void*) ? 1 : -1];
 #  ifdef HAVE_LIMITS_H
 #   include <limits.h>
 #  else
-    /* assuming 32bit(2's compliment) long */
+    /* assuming 32bit(2's complement) long */
 #   define LONG_MAX 2147483647
 #  endif
 # endif
diff --git a/vsnprintf.c b/vsnprintf.c
index 8958aaa41f..5266927d7f 100644
--- a/vsnprintf.c
+++ b/vsnprintf.c
@@ -95,7 +95,7 @@
 #  ifdef HAVE_LIMITS_H
 #   include <limits.h>
 #  else
-    /* assuming 32bit(2's compliment) long */
+    /* assuming 32bit(2's complement) long */
 #   define LONG_MAX 2147483647
 #  endif
 # endif