diff --git a/INSTALL.debian b/INSTALL.debian
index d5d33aafb..56d8bf6e6 100644
--- a/INSTALL.debian
+++ b/INSTALL.debian
@@ -93,6 +93,9 @@ usermod -G danbooru,sudo danbooru
 export PG_VERSION=`pg_config --version | egrep -o '[0-9]{1,}\.[0-9]{1,}'`
 if verlte 9.5 $PG_VERSION ; then
 	# only do this on postgres 9.5 and above
+
+	#necessary to build parser extension
+	apt install postgresql-server-dev-all -y
 	git clone https://github.com/r888888888/test_parser.git /tmp/test_parser
 	cd /tmp/test_parser
 	make install