--- a/crates/jrsonnet-evaluator/src/integrations/serde.rs
+++ b/crates/jrsonnet-evaluator/src/integrations/serde.rs
@@ -161,7 +161,14 @@
 			Val::Bool(v) => serializer.serialize_bool(*v),
 			Val::Null => serializer.serialize_none(),
 			Val::Str(s) => serializer.serialize_str(&s.clone().into_flat()),
-			Val::Num(n) => serializer.serialize_f64(*n),
+			Val::Num(n) => {
+				if n.fract() != 0.0 {
+					serializer.serialize_f64(*n)
+				} else {
+					let n = *n as i64;
+					serializer.serialize_i64(n)
+				}
+			}
 			#[cfg(feature = "exp-bigint")]
 			Val::BigInt(b) => b.serialize(serializer),
 			Val::Arr(arr) => {