diff --git a/build.zig b/build.zig
index 90f7090..1dcf28d 100644
--- a/build.zig
+++ b/build.zig
@@ -205,8 +205,8 @@ pub fn libresslBuild(
 
     // TODO: can we just add this as an install header instead? It's needed during this
     // build. This mutates the source tree, which is really gross.
-    const include_dir = try std.fs.cwd().openDir(install_header_prefix ++ "openssl", .{});
-    try std.fs.cwd().copyFile(header, include_dir, "opensslconf.h", .{});
+    const include_dir = try b.build_root.handle.openDir(install_header_prefix ++ "openssl", .{});
+    try b.build_root.handle.copyFile(header, include_dir, "opensslconf.h", .{});
 
     try header_search(
         b,
@@ -312,7 +312,7 @@ pub fn header_search(
     base: []const u8,
     skiplist: []const SkipSpec,
 ) !void {
-    const dir = try std.fs.cwd().openIterableDir(base, .{});
+    const dir = try b.build_root.handle.openIterableDir(base, .{});
     var walker = try dir.walk(b.allocator);
     defer walker.deinit();