diff --git a/source/ona/kym.zig b/source/ona/kym.zig
index 2fc8f88..69c40fe 100644
--- a/source/ona/kym.zig
+++ b/source/ona/kym.zig
@@ -533,8 +533,8 @@ pub const RuntimeEnv = struct {
 
 			if (arg_count < arity) {
 				return self.raise(error.BadOperation, "expected `{expected}` {noun}, {provided} provided", .{
-					.expected = arity,
-					.provided = arg_count,
+					.expected = arg_count,
+					.provided = arity,
 					.noun = if (arity == 1) "argument" else "arguments",
 				});
 			}