--- a/crates/jrsonnet-evaluator/src/evaluate.rs
+++ b/crates/jrsonnet-evaluator/src/evaluate.rs
@@ -493,8 +493,14 @@
 				0, str: [Val::Str]!!Val::Str, vec![ValType::Str];
 				1, rest, vec![];
 			], {
-				// TODO: Line numbers as in original jsonnet
-				println!("TRACE: {}", str);
+				eprint!("TRACE: ");
+				if let Some(loc) = loc {
+					with_state(|s|{
+						let locs = s.map_source_locations(&loc.0, &[loc.1]);
+						eprint!("{}:{} ", loc.0.display(), locs[0].line);
+					});
+				}
+				eprintln!("{}", str);
 				rest
 			}),
 			("std", "pow") => parse_args!(context, "std.modulo", args, 2, [