diff --git a/src/octoprint/util/pip.py b/src/octoprint/util/pip.py
index 437427be..d03e0034 100644
--- a/src/octoprint/util/pip.py
+++ b/src/octoprint/util/pip.py
@@ -370,10 +370,6 @@ class PipCaller(CommandlineCaller):
 	def _preprocess_lines(self, *lines):
 		return map(self._preprocess, lines)
 
-	@staticmethod
-	def _convert_lines(lines):
-		return map(PipCaller._convert_line, lines)
-
 	@staticmethod
 	def _preprocess(text):
 		"""