diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9e82e2f33c..295ad96c1b 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2015-10-23  Yao Qi  <yao.qi@linaro.org>
+
+	* aarch64-tdep.c (aarch64_displaced_step_copy_insn): Set
+	dsd.insn_count to zero.
+
 2015-10-22  Pedro Alves  <palves@redhat.com>
 
 	* infrun.c (stop_after_trap): Delete.
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 995cbcf542..55c5fb86fc 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -2818,6 +2818,7 @@ aarch64_displaced_step_copy_insn (struct gdbarch *gdbarch,
   dsd.new_addr = to;
   dsd.regs = regs;
   dsd.dsc = dsc;
+  dsd.insn_count = 0;
   aarch64_relocate_instruction (insn, &visitor,
 				(struct aarch64_insn_data *) &dsd);
   gdb_assert (dsd.insn_count <= DISPLACED_MODIFIED_INSNS);