diff --git a/lib/libsmdb/Makefile b/lib/libsmdb/Makefile
index 5dff6b572d1d..9af91b4e8986 100644
--- a/lib/libsmdb/Makefile
+++ b/lib/libsmdb/Makefile
@@ -25,4 +25,4 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 
 .include <bsd.lib.mk>
 
-CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE} ${NO_WSTRICT_PROTOTYPES}