diff --git a/lib/syskit/log/datastore.rb b/lib/syskit/log/datastore.rb
index c6a74b1..1508b8b 100644
--- a/lib/syskit/log/datastore.rb
+++ b/lib/syskit/log/datastore.rb
@@ -43,7 +43,7 @@ def self.create(datastore_path)
             (datastore_path + "core").mkpath
             (datastore_path + "cache").mkpath
             (datastore_path + "incoming").mkpath
-            store = Datastore.new(datastore_path)
+            Datastore.new(datastore_path)
         end
 
         class AmbiguousShortDigest < ArgumentError; end
diff --git a/lib/syskit/log/datastore/dataset.rb b/lib/syskit/log/datastore/dataset.rb
index d87abc1..4776490 100644
--- a/lib/syskit/log/datastore/dataset.rb
+++ b/lib/syskit/log/datastore/dataset.rb
@@ -135,7 +135,7 @@ def self.validate_encoded_short_digest(digest)
                     raise InvalidDigest,
                           "#{digest} does not look like a valid SHA2 digest encoded "\
                           "with #{DIGEST_ENCODING_METHOD}. "\
-                          'Expected characters in 0-9a-zA-Z+'
+                          "Expected characters in 0-9a-zA-Z+"
                 end
                 digest
             end