diff --git a/lib/geo_postgis/extension.ex b/lib/geo_postgis/extension.ex
index bc9c2d5..db51916 100644
--- a/lib/geo_postgis/extension.ex
+++ b/lib/geo_postgis/extension.ex
@@ -47,6 +47,7 @@ defmodule Geo.PostGIS.Extension do
     Geo.LineStringZM,
     Geo.MultiLineString,
     Geo.MultiLineStringZ,
+    Geo.MultiLineStringZM,
     Geo.MultiPoint,
     Geo.MultiPointZ,
     Geo.MultiPolygon,
diff --git a/lib/geo_postgis/geometry.ex b/lib/geo_postgis/geometry.ex
index d141a02..0cde698 100644
--- a/lib/geo_postgis/geometry.ex
+++ b/lib/geo_postgis/geometry.ex
@@ -18,6 +18,7 @@ if Code.ensure_loaded?(Ecto.Type) do
       MultiPointZ,
       MultiLineString,
       MultiLineStringZ,
+      MultiLineStringZM,
       MultiPolygon,
       MultiPolygonZ,
       GeometryCollection
@@ -37,6 +38,7 @@ if Code.ensure_loaded?(Ecto.Type) do
       "MultiPointZ",
       "MultiLineString",
       "MultiLineStringZ",
+      "MultiLineStringZM",
       "MultiPolygon",
       "MultiPolygonZ"
     ]
@@ -55,6 +57,7 @@ if Code.ensure_loaded?(Ecto.Type) do
       MultiPointZ,
       MultiLineString,
       MultiLineStringZ,
+      MultiLineStringZM,
       MultiPolygon,
       MultiPolygonZ,
       GeometryCollection