diff --git a/cps/config_sql.py b/cps/config_sql.py
index a781f2c5..fc43c62c 100644
--- a/cps/config_sql.py
+++ b/cps/config_sql.py
@@ -491,8 +491,10 @@ def autodetect_calibre_binaries():
     else:
         calibre_path = ["/opt/calibre/"]
     for element in calibre_path:
-        supported_binary_paths = [os.path.join(element, binary) for binary in constants.SUPPORTED_CALIBRE_BINARIES.values()]
-        if all(os.path.isfile(binary_path) and os.access(binary_path, os.X_OK) for binary_path in supported_binary_paths):
+        supported_binary_paths = [os.path.join(element, binary)
+                                  for binary in constants.SUPPORTED_CALIBRE_BINARIES.values()]
+        if all(os.path.isfile(binary_path) and os.access(binary_path, os.X_OK)
+               for binary_path in supported_binary_paths):
             values = [process_wait([binary_path, "--version"],
                                    pattern=r'\(calibre (.*)\)') for binary_path in supported_binary_paths]
             if all(values):