diff --git a/dvc/analytics.py b/dvc/analytics.py
index 1ae02f60ac..a8969b2ef3 100644
--- a/dvc/analytics.py
+++ b/dvc/analytics.py
@@ -164,4 +164,6 @@ def _find_or_create_user_id():
             return user_id
 
     except LockError:
-        logger.debug("Failed to acquire {lockfile}".format(lockfile=lockfile))
+        logger.debug(
+            "Failed to acquire '{lockfile}'".format(lockfile=lockfile)
+        )
diff --git a/dvc/command/diff.py b/dvc/command/diff.py
index 180508896c..4e82ea520f 100644
--- a/dvc/command/diff.py
+++ b/dvc/command/diff.py
@@ -31,7 +31,7 @@ def _print_size(size):
     def _get_md5_string(sign, file_name, checksum):
         sample_msg = ""
         if file_name:
-            sample_msg = "{}{} with md5 {}\n"
+            sample_msg = "'{}{}' with md5 {}\n"
             sample_msg = sample_msg.format(sign, file_name, checksum)
         return sample_msg
 
diff --git a/dvc/command/imp_url.py b/dvc/command/imp_url.py
index e072bc1e34..9c325dbe37 100644
--- a/dvc/command/imp_url.py
+++ b/dvc/command/imp_url.py
@@ -19,7 +19,7 @@ def run(self):
             )
         except DvcException:
             logger.exception(
-                "failed to import {}. You could also try downloading "
+                "failed to import '{}'. You could also try downloading "
                 "it manually, and adding it with `dvc add`.".format(
                     self.args.url
                 )