diff --git a/software/glasgow/applet/internal/selftest/__init__.py b/software/glasgow/applet/internal/selftest/__init__.py
index 02e7d046b..f1829c585 100644
--- a/software/glasgow/applet/internal/selftest/__init__.py
+++ b/software/glasgow/applet/internal/selftest/__init__.py
@@ -168,7 +168,7 @@ def decode_pins(bits):
 
             if mode in ("pins-int", "pins-ext", "pins-pull"):
                 if device.revision >= "C0":
-                    raise GlasgowAppletError(f"mode {mode} is broken on device revision "
+                    raise GlasgowAppletError(f"mode {mode} is not supported on device revision "
                                              f"{device.revision}")
 
                 if mode == "pins-int":