diff --git a/ChangeLog b/ChangeLog
index 4d00591efa..bea7d1e5c6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2011-01-24  Jim Meyering  <meyering@redhat.com>
+
+	u64: remove unnecessary #include
+	* lib/u64.h: Don't include <stddef.h>.  It was not used.
+
 2011-01-23  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Allow the user to avoid the GNULIB_TEST_* macros.
diff --git a/lib/u64.h b/lib/u64.h
index c9412f5943..182d64955a 100644
--- a/lib/u64.h
+++ b/lib/u64.h
@@ -17,7 +17,6 @@
 
 /* Written by Paul Eggert.  */
 
-#include <stddef.h>
 #include <stdint.h>
 
 /* Return X rotated left by N bits, where 0 < N < 64.  */