diff --git a/src/main.zig b/src/main.zig
index 9b81ecb..a7f22d2 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -7,7 +7,8 @@ const fmt = std.fmt;
 
 const images_dir_path = "./images";
 
-var registry: mimetypes.Registry = undefined;
+var registry: ?mimetypes.Registry = null;
+var global_allocator: ?*std.mem.Allocator = null;
 
 pub fn main() anyerror!void {
     std.log.info("welcome to webscale", .{});
@@ -16,8 +17,8 @@ pub fn main() anyerror!void {
     defer _ = gpa.deinit();
 
     registry = mimetypes.Registry.init(std.heap.page_allocator);
-    defer registry.deinit();
-    try registry.load();
+    defer registry.?.deinit();
+    try registry.?.load();
 
     // TODO: configurable addr via env var
     const bind_addr = try std.net.Address.parseIp("0.0.0.0", 8080);
@@ -26,6 +27,8 @@ pub fn main() anyerror!void {
     // TODO: configurable path via env var
     try std.fs.cwd().makePath(images_dir_path);
 
+    global_allocator = &gpa.allocator;
+
     try http.listenAndServe(
         &gpa.allocator,
         bind_addr,
@@ -66,7 +69,7 @@ const ContentDisposition = struct {
 
     const Self = @This();
 
-    pub fn deinit(self: *Self) void {
+    pub fn deinit(self: *const Self) void {
         self.allocator.free(self.name);
         self.allocator.free(self.filename);
     }
@@ -92,7 +95,7 @@ const Part = struct {
 
     const Self = @This();
 
-    pub fn deinit(self: *Self) void {
+    pub fn deinit(self: *const Self) void {
         self.disposition.deinit();
         self.allocator.free(self.content_type);
     }
@@ -168,7 +171,7 @@ const Multipart = struct {
         var content_disposition: ?ContentDisposition = null;
         var content_type: ?[]const u8 = null;
 
-        std.log.debug("next bytes: {any}", .{self.stream.buffer[self.stream.pos..(self.stream.pos + 50)]});
+        std.log.debug("next bytes: {s}", .{self.stream.buffer[self.stream.pos..(self.stream.pos + 50)]});
 
         while (try parser.next()) |event| {
             std.log.debug("got event: {}", .{event});