diff --git a/src/http/QueryParams.zig b/src/http/QueryParams.zig
index 8cb36fa..a463260 100644
--- a/src/http/QueryParams.zig
+++ b/src/http/QueryParams.zig
@@ -149,3 +149,25 @@ test "parse transparency" {
     const params_custom = try QueryParams.parse(allocator, "transparency=200");
     try std.testing.expectEqual(@as(u8, 200), params_custom.transparency.?);
 }
+
+test "imperial units selection logic" {
+    // This test documents the priority order for unit selection:
+    // 1. Explicit ?u or ?m parameter (highest priority)
+    // 2. lang=us parameter
+    // 3. US IP detection
+    // 4. Default to metric
+
+    // The actual logic is tested through integration tests
+    // This test just verifies the QueryParams parsing works
+    const allocator = std.testing.allocator;
+
+    const params_u = try QueryParams.parse(allocator, "u");
+    try std.testing.expect(params_u.use_imperial.?);
+
+    const params_m = try QueryParams.parse(allocator, "m");
+    try std.testing.expect(!params_m.use_imperial.?);
+
+    const params_lang = try QueryParams.parse(allocator, "lang=us");
+    defer allocator.free(params_lang.lang.?);
+    try std.testing.expectEqualStrings("us", params_lang.lang.?);
+}
diff --git a/src/http/handler.zig b/src/http/handler.zig
index f34825a..16797e0 100644
--- a/src/http/handler.zig
+++ b/src/http/handler.zig
@@ -136,7 +136,7 @@ fn handleWeatherInternal(
             render_options.use_imperial = true; // this is a US IP
     }
 
-    // Add coordinates header using response allocator
+    // Add coordinates header to response
     const coords_header = try std.fmt.allocPrint(res.arena, "{d:.4},{d:.4}", .{ location.coords.latitude, location.coords.longitude });
     res.headers.add("X-Location-Coordinates", coords_header);
 
@@ -147,7 +147,7 @@ fn handleWeatherInternal(
             res.content_type = .JSON; // reset to json
             try Json.render(res.writer(), weather);
         } else if (std.mem.eql(u8, fmt, "p1")) {
-            try Prometheus.render(res.writer(), weather, req_alloc);
+            try Prometheus.render(res.writer(), weather);
         } else if (std.mem.eql(u8, fmt, "v2")) {
             try V2.render(res.writer(), weather, render_options.use_imperial);
         } else if (std.mem.startsWith(u8, fmt, "%")) {
@@ -198,25 +198,3 @@ fn determineFormat(params: QueryParams, user_agent: ?[]const u8) Formatted.Forma
             return .ansi;
     return .html;
 }
-
-test "imperial units selection logic" {
-    // This test documents the priority order for unit selection:
-    // 1. Explicit ?u or ?m parameter (highest priority)
-    // 2. lang=us parameter
-    // 3. US IP detection
-    // 4. Default to metric
-
-    // The actual logic is tested through integration tests
-    // This test just verifies the QueryParams parsing works
-    const allocator = std.testing.allocator;
-
-    const params_u = try QueryParams.parse(allocator, "u");
-    try std.testing.expect(params_u.use_imperial.?);
-
-    const params_m = try QueryParams.parse(allocator, "m");
-    try std.testing.expect(!params_m.use_imperial.?);
-
-    const params_lang = try QueryParams.parse(allocator, "lang=us");
-    defer allocator.free(params_lang.lang.?);
-    try std.testing.expectEqualStrings("us", params_lang.lang.?);
-}
diff --git a/src/render/Prometheus.zig b/src/render/Prometheus.zig
index eecd3fd..19bbde1 100644
--- a/src/render/Prometheus.zig
+++ b/src/render/Prometheus.zig
@@ -3,7 +3,7 @@ const types = @import("../weather/types.zig");
 const Moon = @import("../Moon.zig");
 const utils = @import("utils.zig");
 
-pub fn render(writer: *std.Io.Writer, weather: types.WeatherData, allocator: std.mem.Allocator) !void {
+pub fn render(writer: *std.Io.Writer, weather: types.WeatherData) !void {
 
     // Current conditions
     try writer.print("# HELP temperature_feels_like_celsius Feels Like Temperature in Celsius\n", .{});
@@ -62,8 +62,8 @@ pub fn render(writer: *std.Io.Writer, weather: types.WeatherData, allocator: std
 
     // Forecast days
     for (weather.forecast, 0..) |day, i| {
-        const forecast_label = try std.fmt.allocPrint(allocator, "{d}d", .{i});
-        defer allocator.free(forecast_label);
+        var buf: [16]u8 = undefined;
+        const forecast_label = try std.fmt.bufPrint(&buf, "{d}d", .{i});
 
         try writer.print("uv_index{{forecast=\"{s}\"}} 0\n", .{forecast_label}); // Not in our data
 
@@ -145,7 +145,7 @@ test "prometheus format includes required metrics" {
     var output_buf: [8192]u8 = undefined;
     var writer = std.Io.Writer.fixed(&output_buf);
 
-    try render(&writer, weather, allocator);
+    try render(&writer, weather);
 
     const output = output_buf[0..writer.end];
 
@@ -182,7 +182,7 @@ test "prometheus format has proper help comments" {
     var output_buf: [4096]u8 = undefined;
     var writer = std.Io.Writer.fixed(&output_buf);
 
-    try render(&writer, weather, allocator);
+    try render(&writer, weather);
 
     const output = output_buf[0..writer.end];