diff --git a/src/Config.zig b/src/Config.zig
index 629df32b..43ca7566 100644
--- a/src/Config.zig
+++ b/src/Config.zig
@@ -156,6 +156,13 @@ pub fn userAgentSuffix(self: *const Config) ?[]const u8 {
     };
 }
 
+pub fn cacheDir(self: *const Config) ?[]const u8 {
+    return switch (self.mode) {
+        inline .serve, .fetch, .mcp => |opts| opts.common.cache_dir,
+        else => null,
+    };
+}
+
 pub fn cdpTimeout(self: *const Config) usize {
     return switch (self.mode) {
         .serve => |opts| if (opts.timeout > 604_800) 604_800_000 else @as(usize, opts.timeout) * 1000,
@@ -240,6 +247,7 @@ pub const Common = struct {
     log_format: ?log.Format = null,
     log_filter_scopes: ?[]log.Scope = null,
     user_agent_suffix: ?[]const u8 = null,
+    cache_dir: ?[]const u8 = null,
 
     web_bot_auth_key_file: ?[]const u8 = null,
     web_bot_auth_keyid: ?[]const u8 = null,
@@ -907,5 +915,14 @@ fn parseCommonArg(
         return true;
     }
 
+    if (std.mem.eql(u8, "--cache_dir", opt)) {
+        const str = args.next() orelse {
+            log.fatal(.app, "missing argument value", .{ .arg = "--cache_dir" });
+            return error.InvalidArgument;
+        };
+        common.cache_dir = try allocator.dupe(u8, str);
+        return true;
+    }
+
     return false;
 }