diff --git a/src/calng/AgipdCorrection.py b/src/calng/AgipdCorrection.py
index 7986831a905a0c2980c913587f5f603eb6de0981..563aca4aee9ac2232a44f699ebf0775b066532db 100644
--- a/src/calng/AgipdCorrection.py
+++ b/src/calng/AgipdCorrection.py
@@ -251,7 +251,7 @@ class AgipdGpuRunner(base_gpu.BaseGpuRunner):
                 )
             else:
                 raise ValueError(
-                    f"What in the world is this shape? {bad_pixels_map.shape}"
+                    f"Unsupported bad pixel map shape: {bad_pixels_map.shape}"
                 )
         else:
             self.bad_pixel_map_gpu |= cupy.asarray(