diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 80deeb4201..fec9974d98 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2017-01-06  Yao Qi  <yao.qi@linaro.org>
+
+	* x86-linux-nat.h: Include gdb_proc_service.h.
+
 2017-01-06  Yao Qi  <yao.qi@linaro.org>
 
 	* ser-base.h: Include serial.h.
diff --git a/gdb/x86-linux-nat.h b/gdb/x86-linux-nat.h
index 7d952aa897..897f98949d 100644
--- a/gdb/x86-linux-nat.h
+++ b/gdb/x86-linux-nat.h
@@ -20,6 +20,8 @@
 #ifndef X86_LINUX_NAT_H
 #define X86_LINUX_NAT_H 1
 
+#include "gdb_proc_service.h"  /* For ps_err_e.  */
+
 
 
 /* Helper for ps_get_thread_area.  Sets BASE_ADDR to a pointer to