diff --git a/macos/Sources/Features/QuickTerminal/QuickTerminalSize.swift b/macos/Sources/Features/QuickTerminal/QuickTerminalSize.swift
index 9f86a7c2b..08bbcb8d9 100644
--- a/macos/Sources/Features/QuickTerminal/QuickTerminalSize.swift
+++ b/macos/Sources/Features/QuickTerminal/QuickTerminalSize.swift
@@ -33,6 +33,7 @@ struct QuickTerminalSize {
             case GHOSTTY_QUICK_TERMINAL_SIZE_PIXELS:
                 self = .pixels(cStruct.value.pixels)
             default:
+                assertionFailure()
                 return nil
             }
         }
diff --git a/src/config/Config.zig b/src/config/Config.zig
index 82e81a01f..20256e951 100644
--- a/src/config/Config.zig
+++ b/src/config/Config.zig
@@ -7987,7 +7987,8 @@ pub const QuickTerminalSize = struct {
             tag: Tag,
             value: Value,
 
-            pub const Tag = enum(u8) { none, percentage, pixels };
+            /// c_int because it needs to be extern compatible
+            pub const Tag = enum(c_int) { none, percentage, pixels };
 
             pub const Value = extern union {
                 percentage: f32,