diff --git a/src/main.zig b/src/main.zig
index 7aab4e8..e89851f 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -239,7 +239,7 @@ fn setRecirculation(allocator: std.mem.Allocator, id_token: []const u8, thing_na
 
     const body = if (duration_minutes) |min|
         try std.fmt.allocPrint(allocator,
-            \\{{"recirculation_duration":"{d}","set_recirculation_enabled":true}}
+            \\{{"recirculation_duration":{d},"set_recirculation_enabled":true}}
         , .{min})
     else
         try allocator.dupe(u8,