diff --git a/src/lib.zig b/src/lib.zig
index 686543a..8d64c61 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -90,3 +90,7 @@ pub inline fn rotr(comptime T: type, x: T, r: anytype) T {
     const ar: Log2Int(T) = @intCast(@mod(r, @typeInfo(T).Int.bits));
     return x >> ar | x << (1 +% ~ar);
 }
+
+pub inline fn alignAddr(comptime T: type, address: u32) u32 {
+    return address & ~@as(u32, @sizeOf(T) - 1);
+}