diff --git a/powerline_shell/segments/env.py b/powerline_shell/segments/env.py
index 29ef048..5403b03 100644
--- a/powerline_shell/segments/env.py
+++ b/powerline_shell/segments/env.py
@@ -4,7 +4,11 @@ from ..utils import BasicSegment
 
 class Segment(BasicSegment):
     def add_to_powerline(self):
-        self.powerline.append(
-            " %s " % os.getenv(self.segment_def["var"]),
+		var_value = os.getenv(self.segment_def["var"])
+		if (not var_value and
+			self.segment_def.get("skip_undefined", False)):
+			return
+		self.powerline.append(
+            " %s " % var_value,
             self.segment_def.get("fg_color", self.powerline.theme.PATH_FG),
-            self.segment_def.get("bg_color", self.powerline.theme.PATH_BG))
+            self.segment_def.get("bg_color", self.powerline.theme.PATH_BG))
\ No newline at end of file