diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 730c53a2e8..ad176c7add 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,7 @@
+2020-01-13  Simon Marchi  <simon.marchi@efficios.com>
+
+	* hostio-errno.c: Include hostio.h.
+
 2020-01-13  Simon Marchi  <simon.marchi@efficios.com>
 
 	* Makefile.in (%-generated.c): Make $(regdat_sh) a regular
diff --git a/gdb/gdbserver/hostio-errno.c b/gdb/gdbserver/hostio-errno.c
index a4c25e04a6..b75e64d212 100644
--- a/gdb/gdbserver/hostio-errno.c
+++ b/gdb/gdbserver/hostio-errno.c
@@ -22,6 +22,9 @@
    on top of errno.  */
 
 #include "server.h"
+
+#include "hostio.h"
+
 #include "gdbsupport/fileio.h"
 
 void