--- a/crates/jrsonnet-stdlib/src/lib.rs
+++ b/crates/jrsonnet-stdlib/src/lib.rs
@@ -105,6 +105,7 @@
 		("mod", builtin_mod::INST),
 		("primitiveEquals", builtin_primitive_equals::INST),
 		("equals", builtin_equals::INST),
+		("xor", builtin_xor::INST),
 		("format", builtin_format::INST),
 		// Sort
 		("sort", builtin_sort::INST),
--- a/crates/jrsonnet-stdlib/src/operator.rs
+++ b/crates/jrsonnet-stdlib/src/operator.rs
@@ -34,6 +34,11 @@
 }
 
 #[builtin]
+pub fn builtin_xor(x: Val, y: Val) -> Result<bool> {
+	Ok(!equals(&x, &y)?)
+}
+
+#[builtin]
 pub fn builtin_format(str: IStr, vals: Val) -> Result<String> {
 	std_format(&str, vals)
 }