diff --git a/packages/typegen/src/util/formatting.ts b/packages/typegen/src/util/formatting.ts
index 9c6699231500..25ed32f3f805 100644
--- a/packages/typegen/src/util/formatting.ts
+++ b/packages/typegen/src/util/formatting.ts
@@ -37,7 +37,8 @@ function extractImports ({ imports, types }: This): string[] {
     ...Object.keys(imports.extrinsicTypes),
     ...Object.keys(imports.genericTypes),
     ...Object.keys(imports.metadataTypes),
-    ...Object.keys(imports.primitiveTypes)
+    ...Object.keys(imports.primitiveTypes),
+    ...Object.keys(imports.lookupTypes)
   ];
 
   return [