diff --git a/debian/tests/installcheck b/debian/tests/installcheck
index 0d037a2..bece692 100755
--- a/debian/tests/installcheck
+++ b/debian/tests/installcheck
@@ -4,4 +4,4 @@
 
 chmod 777 data # testsuite writes temp files there
 
-pg_buildext -i '--auth-local=trust' installcheck
+pg_buildext -i '--auth-local=trust' -o 'shared_preload_libraries=cstore_fdw' installcheck