diff --git a/Makefile b/Makefile
index 09c87263..c75df1cf 100644
--- a/Makefile
+++ b/Makefile
@@ -69,7 +69,9 @@ TOPDIR := .
 
 # Disable certain GCC 8 + glibc 2.28 warning for snprintf()
 # where string truncation for snprintf() is expected.
-DISABLE_WARNING_FLAGS := $(call cc-disable-warning, format-truncation)
+# For GCC9 disable address-of-packed (under W=1)
+DISABLE_WARNING_FLAGS := $(call cc-disable-warning, format-truncation) \
+	$(call cc-disable-warning, address-of-packed-member)
 
 # Common build flags
 CFLAGS = $(SUBST_CFLAGS) \
diff --git a/Makefile.extrawarn b/Makefile.extrawarn
index 0c483785..9cd27917 100644
--- a/Makefile.extrawarn
+++ b/Makefile.extrawarn
@@ -54,6 +54,7 @@ warning-1 += $(call cc-option, -Wunused-but-set-variable)
 warning-1 += $(call cc-disable-warning, missing-field-initializers)
 warning-1 += $(call cc-disable-warning, format-truncation)
 warning-1 += $(call cc-disable-warning, sign-compare)
+warning-2 += $(call cc-option, -Waddress-of-packed-member)
 
 warning-2 := -Waggregate-return
 warning-2 += -Wcast-align