diff --git a/ui/logger/logger.go b/ui/logger/logger.go
index 15c413d..c763e50 100644
--- a/ui/logger/logger.go
+++ b/ui/logger/logger.go
@@ -85,7 +85,7 @@
 	}
 
 	if err := os.Rename(from, newName); err != nil {
-		return fmt.Errorf("Failed to rotate", from, "to", newName, ".", err)
+		return fmt.Errorf("Failed to rotate %s to %s. %s", from, newName, err)
 	}
 	return nil
 }
diff --git a/ui/logger/logger_test.go b/ui/logger/logger_test.go
index dc6f2e9..bdf0231 100644
--- a/ui/logger/logger_test.go
+++ b/ui/logger/logger_test.go
@@ -106,7 +106,7 @@
 			if p == panicValue {
 				os.Exit(42)
 			} else {
-				fmt.Fprintln(os.Stderr, "Expected %q, got %v", panicValue, p)
+				fmt.Fprintf(os.Stderr, "Expected %q, got %v\n", panicValue, p)
 				os.Exit(3)
 			}
 		}()