diff --git a/src/sections.zig b/src/sections.zig
index 3cd4988..97fb6c3 100644
--- a/src/sections.zig
+++ b/src/sections.zig
@@ -693,29 +693,30 @@ test "users compare function" {
     try testing.expect(!cmpUser({}, bb, b));
 }
 
-test "bdzIdx" {
-    const allocator = testing.allocator;
-    const k_u32 = [_]u32{ 42, 1, 2, 3 };
-    const k_str = [_][]const u8{ "42", "1", "2", "3" };
-    assert(k_u32.len == k_str.len);
-    const mphf_str = try cmph.packStr(allocator, k_str[0..]);
-    const mphf_u32 = try cmph.packU32(allocator, k_u32[0..]);
-    defer allocator.free(mphf_str);
-    defer allocator.free(mphf_u32);
-
-    {
-        var result = try bdzIdx(u32, allocator, mphf_u32, k_u32[0..]);
-        defer allocator.free(result);
-        var used = [_]bool{false} ** k_u32.len;
-        for (result) |elem| used[result[elem]] = true;
-        for (used) |item| try testing.expect(item);
-    }
-
-    {
-        var result = try bdzIdx([]const u8, allocator, mphf_str, k_str[0..]);
-        defer allocator.free(result);
-        var used = [_]bool{false} ** k_u32.len;
-        for (result) |elem| used[result[elem]] = true;
-        for (used) |item| try testing.expect(item);
-    }
+fn expectUsedHashes(allocator: Allocator, arr: []const u32) !void {
+    var used = try allocator.alloc(bool, arr.len);
+    defer allocator.free(used);
+    mem.set(bool, used, false);
+    for (arr) |elem|
+        used[arr[elem]] = true;
+    for (used) |item|
+        try testing.expect(item);
+}
+
+test "bdzIdx on u32" {
+    const keys = [_]u32{ 42, 1, 2, 3 };
+    const mphf = try cmph.packU32(testing.allocator, keys[0..]);
+    defer testing.allocator.free(mphf);
+    var result = try bdzIdx(u32, testing.allocator, mphf, keys[0..]);
+    defer testing.allocator.free(result);
+    try expectUsedHashes(testing.allocator, result);
+}
+
+test "bdzIdx on str" {
+    const keys = [_][]const u8{ "42", "1", "2", "3" };
+    const mphf = try cmph.packStr(testing.allocator, keys[0..]);
+    defer testing.allocator.free(mphf);
+    var result = try bdzIdx([]const u8, testing.allocator, mphf, keys[0..]);
+    defer testing.allocator.free(result);
+    try expectUsedHashes(testing.allocator, result);
 }