1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index b2d5924b..894874ae 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 PROGS=notmuch
 
-CXXWARNINGS_FLAGS=-Wall -Wextra -Wwrite-strings
+CXXWARNINGS_FLAGS=-Wall -Wextra -Wmissing-declarations -Wwrite-strings
 CWARNINGS_FLAGS=$(CXXWARNINGS_FLAGS)
 
 CDEPENDS_FLAGS=`pkg-config --cflags glib-2.0 talloc`