diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index fcaae6125e..2974d7275c 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,9 @@
 2019-02-14  Thomas Schwinge  <thomas@codesourcery.com>
 
+	* configure.nat [gdb_host == i386gnu] (NATDEPFILES): Add
+	'nat/fork-inferior.o'.
+	* gnu-nat.c: #include "nat/fork-inferior.h".
+
 	* gnu-nat.c (gnu_nat_target::detach): Instead of
 	'inf_child_maybe_unpush_target (ops)' call 'maybe_unpush_target'.
 	* gnu-nat.h: #include "inf-child.h".
diff --git a/gdb/configure.nat b/gdb/configure.nat
index 3118263ac6..64ee101d83 100644
--- a/gdb/configure.nat
+++ b/gdb/configure.nat
@@ -215,6 +215,7 @@ case ${gdb_host} in
 		# Host: Intel 386 running the GNU Hurd
 		NATDEPFILES='i386-gnu-nat.o gnu-nat.o \
 		     x86-nat.o nat/x86-dregs.o fork-child.o \
+		     nat/fork-inferior.o \
 		     notify_S.o process_reply_S.o msg_reply_S.o \
 		     msg_U.o exc_request_U.o exc_request_S.o'
 		HAVE_NATIVE_GCORE_HOST=1
diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
index 78966c805d..5a47cb7d63 100644
--- a/gdb/gnu-nat.c
+++ b/gdb/gnu-nat.c
@@ -69,6 +69,7 @@ extern "C"
 #include "gdbthread.h"
 #include "gdb_obstack.h"
 #include "tid-parse.h"
+#include "nat/fork-inferior.h"
 
 #include "inf-child.h"