diff --git a/src/DB.zig b/src/DB.zig
index 53d3413..aaac6e4 100644
--- a/src/DB.zig
+++ b/src/DB.zig
@@ -456,9 +456,7 @@ fn usersSection(
     while (i < corpus.users.len) : (i += 1) {
         // TODO: this is inefficient by calling `.slice()` on every iteration
         const user = corpus.users.get(i);
-        const user_offset = math.cast(u35, blob.items.len) catch |err| switch (err) {
-            error.Overflow => return error.TooMany,
-        };
+        const user_offset = math.cast(u35, blob.items.len) orelse return error.TooMany;
         assert(user_offset & 7 == 0);
         idx2offset[i] = @truncate(u32, user_offset >> 3);
         try PackedUser.packTo(
diff --git a/src/File.zig b/src/File.zig
index a3ac21d..15813b4 100644
--- a/src/File.zig
+++ b/src/File.zig
@@ -51,17 +51,23 @@ pub const TestFile = struct {
         var tmp = testing.tmpDir(.{});
         errdefer tmp.cleanup();
 
+        const base_path = blk: {
+            const relative_path = try fs.path.join(allocator, &[_][]const u8{ "zig-cache", "tmp", tmp.sub_path[0..] });
+            const real_path = try fs.realpathAlloc(allocator, relative_path);
+            allocator.free(relative_path);
+            break :blk real_path;
+        };
+
+        const full_path = try fs.path.join(allocator, &[_][]const u8{ base_path, "db.turbo\x00" });
+        allocator.free(base_path);
+
         const mode = os.O.RDWR | os.O.CREAT | os.O.EXCL;
         const fd = try os.openat(tmp.dir.fd, "db.turbo", mode, 0o666);
         defer os.close(fd);
 
         _ = try os.writev(fd, db.iov().constSlice());
-        const dir_path = try tmp.getFullPath(allocator);
-        defer allocator.free(dir_path);
 
-        const full = &[_][]const u8{ dir_path, "db.turbo\x00" };
-        var result = try fs.path.join(allocator, full);
-        return TestFile{ .dir = tmp, .path = result[0 .. result.len - 1 :0] };
+        return TestFile{ .dir = tmp, .path = full_path[0 .. full_path.len - 1 :0] };
     }
 
     pub fn deinit(self: *TestFile, allocator: Allocator) void {
diff --git a/src/bdz.zig b/src/bdz.zig
index acff6e7..2701b88 100644
--- a/src/bdz.zig
+++ b/src/bdz.zig
@@ -3,7 +3,7 @@ const std = @import("std");
 extern fn bdz_search_packed(packed_mphf: [*]const u8, key: [*]const u8, len: c_uint) u32;
 
 pub fn search(packed_mphf: []const u8, key: []const u8) u32 {
-    const len = std.math.cast(c_uint, key.len) catch unreachable;
+    const len = std.math.cast(c_uint, key.len).?;
     return @as(u32, bdz_search_packed(packed_mphf.ptr, key.ptr, len));
 }
 
diff --git a/src/validate.zig b/src/validate.zig
index 657c526..ccb4755 100644
--- a/src/validate.zig
+++ b/src/validate.zig
@@ -1,11 +1,7 @@
 const std = @import("std");
 
 pub fn downCast(comptime T: type, n: u64) error{InvalidRecord}!T {
-    return std.math.cast(T, n) catch |err| switch (err) {
-        error.Overflow => {
-            return error.InvalidRecord;
-        },
-    };
+    return std.math.cast(T, n) orelse return error.InvalidRecord;
 }
 
 pub fn utf8(s: []const u8) error{InvalidRecord}!void {