diff --git a/src/reskit/cli/evaluator.rs b/src/reskit/cli/evaluator.rs
index 1109ae6..4d598f3 100644
--- a/src/reskit/cli/evaluator.rs
+++ b/src/reskit/cli/evaluator.rs
@@ -94,10 +94,9 @@ pub fn run_command() -> Result<(), Box<dyn Error>> {
 
             let symbol_ids = all_symbols;
             let sprite_ids = all_sprites;
-            // TODO: will be used when custom object fields are implemented
-            let _fields: Vec<&str> = fields.split( "," ).collect();
+            let fields: Vec<&str> = fields.split( "," ).collect();
 
-            let tiled_file = get_tiled_tilemap( &input_file )?;
+            let tiled_file = get_tiled_tilemap( &input_file, &fields )?;
 
             // Get tile and palette files
             let ( all_tiles, palettes ) = get_tiles( &tiled_file )?;
diff --git a/src/reskit/level/converter.rs b/src/reskit/level/converter.rs
index 754999f..ce2b3dd 100644
--- a/src/reskit/level/converter.rs
+++ b/src/reskit/level/converter.rs
@@ -211,7 +211,7 @@ fn get_tiles( tileset: Node, first_gid: usize, working_directory: &str ) -> Resu
     Ok( TiledTileset { first_gid, image, palettes, tile_order, sprite_metadata } )
 }
 
-pub fn get_objs( node: &Node ) -> Result<Vec<Object>, Box<dyn Error>> {
+pub fn get_objs( node: &Node, object_fields: &Vec<&str> ) -> Result<Vec<Object>, Box<dyn Error>> {
     let mut result = Vec::new();
 
     let objects = node.descendants().filter( | node | node.tag_name() == "object".into() );
@@ -233,7 +233,17 @@ pub fn get_objs( node: &Node ) -> Result<Vec<Object>, Box<dyn Error>> {
                 attributes.insert( "x".trim().to_owned(), x );
                 attributes.insert( "y".trim().to_owned(), y );
 
-                // TODO: Custom object fields
+                // Custom object fields - push these in order into the LinkedHashMap
+                for field in object_fields {
+                    let property = properties.descendants().find( | node | node.attribute( "name" ) == Some( &format!( "reskit-field[{}]", field ) ) );
+                    if let Some( property ) = property {
+                        let value = property.attribute( "value" ).ok_or( "invalid file: property has no value attribute" )?.to_owned();
+                        attributes.insert( field.to_string(), value );
+                    } else {
+                        print_warning( &format!( "object {} does not define a value for struct field \"{}\", this field will be filled in with 0x00 at export", id, field ) );
+                        attributes.insert( field.to_string(), "0".to_owned() );
+                    }
+                }
 
                 result.push( Object { id, attributes } );
             } else {
@@ -247,7 +257,7 @@ pub fn get_objs( node: &Node ) -> Result<Vec<Object>, Box<dyn Error>> {
     Ok( result )
 }
 
-pub fn get_tiled_tilemap( path: &str ) -> Result<TiledTilemap, Box<dyn Error>> {
+pub fn get_tiled_tilemap( path: &str, object_fields: &Vec<&str> ) -> Result<TiledTilemap, Box<dyn Error>> {
     let file = read_to_string( path )?;
     let document = roxmltree::Document::parse( &file )?;
     let working_directory = {
@@ -341,7 +351,7 @@ pub fn get_tiled_tilemap( path: &str ) -> Result<TiledTilemap, Box<dyn Error>> {
         // Get the entity-component system
         let object_group = map.descendants().find( | node | node.tag_name() == "objectgroup".into() );
         let objects = if let Some( object_group ) = object_group {
-            get_objs( &object_group )?
+            get_objs( &object_group, object_fields )?
         } else {
             Vec::new()
         };