diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index cbff2ec6a..2a209a7de 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,8 @@
+2014-12-10  Richard Earnshaw  <rearnsha@arm.com>
+
+	* libc/machine/aarch64/strchrnul.S (vrepmask): Use a call-clobbered
+	register.
+
 2014-12-08  Richard Earnshaw  <rearnsha@arm.com>
 
 	* libc/machine/aarch64/strrchr.S: New file.
diff --git a/newlib/libc/machine/aarch64/strchrnul.S b/newlib/libc/machine/aarch64/strchrnul.S
index 5e67f1da9..a0ac13b7f 100644
--- a/newlib/libc/machine/aarch64/strchrnul.S
+++ b/newlib/libc/machine/aarch64/strchrnul.S
@@ -55,7 +55,7 @@
 #define vhas_nul2	v4
 #define vhas_chr1	v5
 #define vhas_chr2	v6
-#define vrepmask	v15
+#define vrepmask	v7
 #define vend1		v16
 
 /* Core algorithm.