diff --git a/tools/gdctl b/tools/gdctl
index 0602f5b27..3e6dfec28 100755
--- a/tools/gdctl
+++ b/tools/gdctl
@@ -26,6 +26,9 @@ class Dimension(NamedTuple):
     width: int
     height: int
 
+    def __str__(self):
+        return f"{self.width}x{self.height}"
+
 
 class Position(NamedTuple):
     x: int | None