diff --git a/x-pack/plugins/maps/public/classes/fields/geojson_file_field.ts b/x-pack/plugins/maps/public/classes/fields/geojson_file_field.ts
index 38be25054e05a..ae42b09d491c5 100644
--- a/x-pack/plugins/maps/public/classes/fields/geojson_file_field.ts
+++ b/x-pack/plugins/maps/public/classes/fields/geojson_file_field.ts
@@ -11,18 +11,22 @@ import { GeoJsonFileSource } from '../sources/geojson_file_source';
 
 export class GeoJsonFileField extends AbstractField implements IField {
   private readonly _source: GeoJsonFileSource;
+  private readonly _dataType: string;
 
   constructor({
     fieldName,
     source,
     origin,
+    dataType,
   }: {
     fieldName: string;
     source: GeoJsonFileSource;
     origin: FIELD_ORIGIN;
+    dataType: string;
   }) {
     super({ fieldName, origin });
     this._source = source;
+    this._dataType = dataType;
   }
 
   getSource(): IVectorSource {
@@ -32,4 +36,8 @@ export class GeoJsonFileField extends AbstractField implements IField {
   async getLabel(): Promise<string> {
     return this.getName();
   }
+
+  async getDataType(): Promise<string> {
+    return this._dataType;
+  }
 }
diff --git a/x-pack/plugins/maps/public/classes/sources/geojson_file_source/geojson_file_source.ts b/x-pack/plugins/maps/public/classes/sources/geojson_file_source/geojson_file_source.ts
index 0b84d4a28861b..d0d69fbb5fb86 100644
--- a/x-pack/plugins/maps/public/classes/sources/geojson_file_source/geojson_file_source.ts
+++ b/x-pack/plugins/maps/public/classes/sources/geojson_file_source/geojson_file_source.ts
@@ -72,6 +72,7 @@ export class GeoJsonFileSource extends AbstractVectorSource {
       fieldName: descriptor.name,
       source: this,
       origin: FIELD_ORIGIN.SOURCE,
+      dataType: descriptor.type,
     });
   }
 
@@ -82,6 +83,7 @@ export class GeoJsonFileSource extends AbstractVectorSource {
         fieldName: field.name,
         source: this,
         origin: FIELD_ORIGIN.SOURCE,
+        dataType: field.type,
       });
     });
   }