diff --git a/src/aro/Preprocessor.zig b/src/aro/Preprocessor.zig
index 63bf0858..8e3f535a 100644
--- a/src/aro/Preprocessor.zig
+++ b/src/aro/Preprocessor.zig
@@ -271,7 +271,7 @@ fn clearBuffers(pp: *Preprocessor) void {
 pub fn expansionSlice(pp: *Preprocessor, tok: Tree.TokenIndex) []Source.Location {
     const S = struct {
         fn orderTokenIndex(context: Tree.TokenIndex, item: Tree.TokenIndex) std.math.Order {
-            return std.math.order(item, context);
+            return std.math.order(context, item);
         }
     };
 
diff --git a/src/aro/Tokenizer.zig b/src/aro/Tokenizer.zig
index f703940f..7ab33103 100644
--- a/src/aro/Tokenizer.zig
+++ b/src/aro/Tokenizer.zig
@@ -2151,12 +2151,13 @@ test "C23 keywords" {
 }
 
 test "Tokenizer fuzz test" {
+    return std.testing.fuzz(testTokenizerFuzz, .{});
+}
+
+fn testTokenizerFuzz(input_bytes: []const u8) anyerror!void {
     var comp = Compilation.init(std.testing.allocator, std.fs.cwd());
     defer comp.deinit();
 
-    const input_bytes = std.testing.fuzzInput(.{});
-    if (input_bytes.len == 0) return;
-
     const source = try comp.addSourceFromBuffer("fuzz.c", input_bytes);
 
     var tokenizer: Tokenizer = .{