1 files changed, 1 insertions, 0 deletions
diff --git a/build/flags.mk b/build/flags.mk
index c50b077..e0d67d5 100644
--- a/build/flags.mk
+++ b/build/flags.mk
@@ -90,6 +90,7 @@ CFLAGS ?= \
     -Werror=implicit \
     -Wimplicit-fallthrough \
     -Wmissing-declarations \
+    -Wmissing-variable-declarations \
     -Wshadow \
     -Wsign-compare \
     -Wstrict-prototypes