diff --git a/docs/ref/dbf.rst b/docs/ref/dbf.rst
index 4e6ffc1..e6af1d5 100644
--- a/docs/ref/dbf.rst
+++ b/docs/ref/dbf.rst
@@ -65,7 +65,8 @@ When migrating from DB3 the following Casting Rules are provided::
 
   type C to text using db3-trim-string
   type M to text using db3-trim-string
-  type N to numeric using db3-numeric-to-pgsql-numeric
+  type N to numeric using db3-numeric-to-pgsql-integer
+  type I to numeric using db3-numeric-to-pgsql-numeric
   type L to boolean using logical-to-boolean
   type D to date using db3-date-to-pgsql-date
 
diff --git a/src/sources/db3/db3-cast-rules.lisp b/src/sources/db3/db3-cast-rules.lisp
index 908c670..a711d68 100644
--- a/src/sources/db3/db3-cast-rules.lisp
+++ b/src/sources/db3/db3-cast-rules.lisp
@@ -16,6 +16,10 @@
      :target (:type "numeric")
      :using pgloader.transforms::db3-numeric-to-pgsql-numeric)
 
+    (:source (:type "I")
+     :target (:type "integer")
+     :using pgloader.transforms::db3-numeric-to-pgsql-integer)
+
     (:source (:type "L")
      :target (:type "boolean")
      :using pgloader.transforms::logical-to-boolean)