diff --git a/calendar/teachingdates/config/config.py b/calendar/teachingdates/config/config.py
index 31bbed7..ee26bf7 100644
--- a/calendar/teachingdates/config/config.py
+++ b/calendar/teachingdates/config/config.py
@@ -59,17 +59,17 @@
             # Papers are only relevant in "lecture" style, which by definition
             # must specify a paper.
             try:
-                if (self.style == "lecture"
-                        and "papers" in period_config.keys()
-                        and self.paper in period_config["papers"].keys()):
-                    paper_config = period_config["papers"][self.paper]
-                    # we expect at least a "lectures" entry
-                    if (not paper_config
-                            or "lectures" not in paper_config.keys()):
-                        raise PaperKeyError("lectures", self.paper,
-                                            self.config_file)
-                else:
-                    raise PaperError(str(self.config_file))
+                if self.style == "lecture":
+                    if ("papers" in period_config.keys()
+                            and self.paper in period_config["papers"].keys()):
+                        paper_config = period_config["papers"][self.paper]
+                        # we expect at least a "lectures" entry
+                        if (not paper_config
+                                or "lectures" not in paper_config.keys()):
+                            raise PaperKeyError("lectures", self.paper,
+                                                self.config_file)
+                    else:
+                        raise PaperError(str(self.config_file))
             except AttributeError as e:
                 raise PaperError(str(self.config_file))