diff --git a/source/core.cpp b/source/core.cpp
index 4edacce..89de699 100644
--- a/source/core.cpp
+++ b/source/core.cpp
@@ -461,7 +461,7 @@ export namespace core {
 	 * Tests the equality of `a` against `b`, returning `true` if they contain identical bytes,
 	 * otherwise `false`.
 	 */
-	bool equals(slice<u8 const> const & a, slice<u8 const> const & b) {
+	constexpr bool equals(slice<u8 const> const & a, slice<u8 const> const & b) {
 		if (a.length != b.length) return false;
 
 		for (size_t i = 0; i < a.length; i += 1) if (a[i] != b[i]) return false;