diff --git a/system/dialogs.py b/system/dialogs.py
index 2c05877..807584c 100644
--- a/system/dialogs.py
+++ b/system/dialogs.py
@@ -7,7 +7,8 @@ import gobject
 from system import logger, project, workflow
 import workflows
 
-GLADEFILENAME = os.path.dirname(sys.argv[0]) + '/system/fluent.glade'
+DATADIR = os.path.dirname(sys.modules['system'].__file__)
+GLADEFILENAME = os.path.join(DATADIR, 'fluent.glade')
 
 class CreateProjectDruid(gtk.Window):
     """A druid for creating a new project.
diff --git a/system/fluents.py b/system/fluents.py
index 520255f..a79cfe8 100755
--- a/system/fluents.py
+++ b/system/fluents.py
@@ -17,7 +17,8 @@ from system import project, workflow, dataset, logger, plots, navigator, dialogs
 
 PROGRAM_NAME = 'fluents'
 VERSION = '0.1.0'
-GLADEFILENAME = os.path.dirname(sys.argv[0]) + '/system/fluent.glade'
+DATADIR = os.path.dirname(sys.modules['system'].__file__)
+GLADEFILENAME = os.path.join(DATADIR, 'fluent.glade')
 
 class FluentApp: