diff --git a/pisi/configfile.py b/pisi/configfile.py
index cadaa0b8..cccca1d4 100644
--- a/pisi/configfile.py
+++ b/pisi/configfile.py
@@ -62,9 +62,9 @@ class GeneralDefaults:
     autoclean = False
     distribution = "Pardus"
     distribution_release = "2007"
-    http_proxy = os.getenv("HTTP_PROXY") or None
-    https_proxy = os.getenv("HTTPS_PROXY") or None
-    ftp_proxy = os.getenv("FTP_PROXY") or None
+    http_proxy = (os.getenv("http_proxy") or os.getenv("HTTP_PROXY")) or None
+    https_proxy = (os.getenv("https_proxy") or os.getenv("HTTPS_PROXY")) or None
+    ftp_proxy = (os.getenv("ftp_proxy") or os.getenv("FTP_PROXY")) or None
 
 class BuildDefaults:
     """Default values for [build] section"""