diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index f2992f1784..ea5352dfd0 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2020-01-13  Simon Marchi  <simon.marchi@efficios.com>
+
+	* warning.m4: Add -Wmissing-declarations to build_warnings.
+	* configure: Re-generate.
+
 2020-01-13  Simon Marchi  <simon.marchi@efficios.com>
 
 	* python/python.c (init__gdb_module): Add declaration.
diff --git a/gdb/configure b/gdb/configure
index b572d414ca..aa53c097ca 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -16105,7 +16105,8 @@ build_warnings="-Wall -Wpointer-arith \
 -Wshadow=local \
 -Wdeprecated-copy \
 -Wdeprecated-copy-dtor \
--Wredundant-move"
+-Wredundant-move \
+-Wmissing-declarations"
 
 case "${host}" in
   *-*-mingw32*)
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 233bc62136..bb0bc7a6c3 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,7 @@
+2020-01-13  Simon Marchi  <simon.marchi@efficios.com>
+
+	* configure: Re-generate.
+
 2020-01-13  Simon Marchi  <simon.marchi@efficios.com>
 
 	* tracepoint.h (IP_AGENT_EXPORT_FUNC) [!IN_PROCESS_AGENT]:
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index 4de751b449..f70b3d5521 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -8094,7 +8094,8 @@ build_warnings="-Wall -Wpointer-arith \
 -Wshadow=local \
 -Wdeprecated-copy \
 -Wdeprecated-copy-dtor \
--Wredundant-move"
+-Wredundant-move \
+-Wmissing-declarations"
 
 case "${host}" in
   *-*-mingw32*)
diff --git a/gdb/warning.m4 b/gdb/warning.m4
index 00bcdfa7ea..e2b8a43ddb 100644
--- a/gdb/warning.m4
+++ b/gdb/warning.m4
@@ -49,7 +49,8 @@ build_warnings="-Wall -Wpointer-arith \
 -Wshadow=local \
 -Wdeprecated-copy \
 -Wdeprecated-copy-dtor \
--Wredundant-move"
+-Wredundant-move \
+-Wmissing-declarations"
 
 case "${host}" in
   *-*-mingw32*)