diff --git a/ocrd_validators/ocrd_validators/workspace_validator.py b/ocrd_validators/ocrd_validators/workspace_validator.py
index 8a0973baee..7a1a239cb4 100644
--- a/ocrd_validators/ocrd_validators/workspace_validator.py
+++ b/ocrd_validators/ocrd_validators/workspace_validator.py
@@ -155,7 +155,7 @@ def _validate_pixel_density(self):
             for k in ['xResolution', 'yResolution']:
                 v = exif.__dict__.get(k)
                 if v is None or v <= 72:
-                    self.report.add_error("Image %s: %s (%s pixels per %s) is too low" % (f.ID, k, v, exif.resolutionUnit))
+                    self.report.add_warning("Image %s: %s (%s pixels per %s) is too low" % (f.ID, k, v, exif.resolutionUnit))
 
     def _validate_mets_file_group_names(self):
         """