diff --git a/pg/crankshaft.control b/pg/crankshaft.control
index 208ffb6..08df0ee 100644
--- a/pg/crankshaft.control
+++ b/pg/crankshaft.control
@@ -1,5 +1,5 @@
 comment = 'CartoDB Spatial Analysis extension'
 default_version = '0.0.1'
-requires = 'plpythonu'
+requires = 'plpythonu, postgis'
 superuser = true
 schema = cdb_crankshaft