diff --git a/dak/check_archive.py b/dak/check_archive.py
index 348344bc0e2f5e8aade64551d3fb9b39fda0ac83..62e111a5f45bc5a9dc1ceb4b34daf597700dcf18 100644
--- a/dak/check_archive.py
+++ b/dak/check_archive.py
@@ -219,8 +219,8 @@ def check_override():
         q = session.execute("""
 SELECT DISTINCT b.package FROM binaries b, bin_associations ba
  WHERE b.id = ba.bin AND ba.suite = :suiteid AND NOT EXISTS
-       (SELECT 1 FROM override o WHERE o.suite = :suiteid AND o.package = b.package)"""
-                          % {'suiteid': suite.suite_id})
+       (SELECT 1 FROM override o WHERE o.suite = :suiteid AND o.package = b.package)""",
+            {'suiteid': suite.suite_id})
 
         for j in q.fetchall():
             print(j[0])
@@ -228,8 +228,8 @@ SELECT DISTINCT b.package FROM binaries b, bin_associations ba
         q = session.execute("""
 SELECT DISTINCT s.source FROM source s, src_associations sa
   WHERE s.id = sa.source AND sa.suite = :suiteid AND NOT EXISTS
-       (SELECT 1 FROM override o WHERE o.suite = :suiteid and o.package = s.source)"""
-                          % {'suiteid': suite.suite_id})
+       (SELECT 1 FROM override o WHERE o.suite = :suiteid and o.package = s.source)""",
+            {'suiteid': suite.suite_id})
         for j in q.fetchall():
             print(j[0])
 
diff --git a/dak/process_policy.py b/dak/process_policy.py
index a274a8f66023af5633e175789cdc4f603e9b2080..f3c3b7a0377171d9101570e9eb06659f356c864c 100644
--- a/dak/process_policy.py
+++ b/dak/process_policy.py
@@ -177,7 +177,7 @@ def comment_accept(upload, srcqueue, comments, transaction):
         source_component = source_component_func(upload.source)
         if upload.target_suite.suite_name in cnf.value_list('Dinstall::ThrowAwayNewBinarySuites') and \
            source_component.component_name in cnf.value_list('Dinstall::ThrowAwayNewBinaryComponents'):
-                throw_away_binaries = True
+            throw_away_binaries = True
 
     for suite in all_target_suites:
         debug_suite = suite.debug_suite
diff --git a/daklib/checks.py b/daklib/checks.py
index 53c757fcdef08fc8745dce20fa91088531f5bbfc..558b2fbc3c52ee3d5f7ff890444410004b1f691a 100644
--- a/daklib/checks.py
+++ b/daklib/checks.py
@@ -476,7 +476,7 @@ class BinaryCheck(Check):
                     raise Reject('{0}: APT could not parse {1} field'.format(fn, field))
                 for group in depends:
                     if not allow_alternatives and len(group) != 1:
-                        raise Reject('{0}: {1}: alternatives are not allowed'.format(fn))
+                        raise Reject('{0}: {1}: alternatives are not allowed'.format(fn, field))
                     for dep_pkg, dep_ver, dep_rel in group:
                         if dep_rel not in allow_relations:
                             raise Reject('{}: {}: depends on {}, but only relations {} are allowed for this field'.format(fn, field, " ".join(dep_pkg, dep_rel, dep_ver), allow_relations))
@@ -557,7 +557,7 @@ class SourceCheck(Check):
         if is_orig:
             upstream_match = re_field_version_upstream.match(version)
             if not upstream_match:
-                raise Reject('{0}: Source package includes upstream tarball, but {0} has no Debian revision.'.format(filename, version))
+                raise Reject('{0}: Source package includes upstream tarball, but {1} has no Debian revision.'.format(filename, version))
             version = upstream_match.group('upstream')
         version_match = re_field_version.match(version)
         version_without_epoch = version_match.group('without_epoch')