diff --git a/source/core.cpp b/source/core.cpp
index 88b1140..3e6cc0f 100644
--- a/source/core.cpp
+++ b/source/core.cpp
@@ -480,7 +480,14 @@ export namespace core {
 	void copy(slice<u8> const & target, slice<u8 const> const & origin) {
 		if (target.length < origin.length) core::unreachable();
 
-		for (usize i = 0; i < origin.length; i += 1) target[i] = origin[i];
+		for (usize i = 0; i < target.length; i += 1) target[i] = origin[i];
+	}
+
+	/**
+	 * Zeroes the contents of `target`.
+	 */
+	void zero(slice<u8> const & target) {
+		for (usize i = 0; i < target.length; i += 1) target[i] = 0;
 	}
 
 	/**