diff --git a/capellambse/svg/drawing.py b/capellambse/svg/drawing.py
index fba427c21..7a9497c9d 100644
--- a/capellambse/svg/drawing.py
+++ b/capellambse/svg/drawing.py
@@ -294,6 +294,11 @@ def _draw_label(self, builder: LabelBuilder) -> None:
 
         if transform := getattr(builder.labelstyle, "transform", None):
             if match := re.search(RE_ROTATION, transform):
+                if match.group("angle") != "-90":
+                    raise NotImplementedError(
+                        "Angles other than -90 are not supported"
+                    )
+
                 x = float(match.group("x"))
                 y = float(match.group("y"))
                 if new_y := match.group("tspan_y"):