--- a/crates/jrsonnet-stdlib/src/lib.rs
+++ b/crates/jrsonnet-stdlib/src/lib.rs
@@ -114,6 +114,7 @@
 		("primitiveEquals", builtin_primitive_equals::INST),
 		("equals", builtin_equals::INST),
 		("xor", builtin_xor::INST),
+		("xnor", builtin_xnor::INST),
 		("format", builtin_format::INST),
 		// Sort
 		("sort", builtin_sort::INST),
--- a/crates/jrsonnet-stdlib/src/operator.rs
+++ b/crates/jrsonnet-stdlib/src/operator.rs
@@ -39,6 +39,11 @@
 }
 
 #[builtin]
+pub fn builtin_xnor(x: bool, y: bool) -> bool {
+	x == y
+}
+
+#[builtin]
 pub fn builtin_format(str: IStr, vals: Val) -> Result<String> {
 	std_format(&str, vals)
 }