diff --git a/focus_sequence_FLI.py b/focus_sequence_FLI.py
index bbff206..d0c16bc 100755
--- a/focus_sequence_FLI.py
+++ b/focus_sequence_FLI.py
@@ -41,7 +41,7 @@ def get_image(filename, exp_time):
 
 if __name__ == "__main__":
     parser = ap.ArgumentParser(
-        prog=sys.argv[1],
+        prog=sys.argv[0],
         description="FLI CCD and focuser hardware: focussing sequence implementation. It is assumed that 'fli_control' software is installed in the OS.",
     )
 
diff --git a/focus_sequence_SKEL.py b/focus_sequence_SKEL.py
index 5727d04..82be118 100755
--- a/focus_sequence_SKEL.py
+++ b/focus_sequence_SKEL.py
@@ -27,7 +27,7 @@ def get_image(filename, exp_time):
 
 
 if __name__ == "__main__":
-    parser = ap.ArgumentParser(prog=sys.argv[1])
+    parser = ap.ArgumentParser(prog=sys.argv[0])
 
     parser.add_argument("focus_start", help="focus start value", type=float)
     parser.add_argument("focus_stop", help="focus stop value", type=float)
diff --git a/focus_sequence_Z1000_Ixon.py b/focus_sequence_Z1000_Ixon.py
index c437f25..7be1835 100755
--- a/focus_sequence_Z1000_Ixon.py
+++ b/focus_sequence_Z1000_Ixon.py
@@ -43,7 +43,7 @@ def get_image(filename, exp_time):
 
 
 if __name__ == "__main__":
-    parser = ap.ArgumentParser(prog=sys.argv[1])
+    parser = ap.ArgumentParser(prog=sys.argv[0])
 
     parser.add_argument("focus_start", help="focus start value", type=float)
     parser.add_argument("focus_stop", help="focus stop value", type=float)