diff --git a/mprof b/mprof
index adfe6d4..c70eb68 100755
--- a/mprof
+++ b/mprof
@@ -188,9 +188,10 @@ def run_action():
     parser.add_argument("--multiprocess", "-M", dest="multiprocess", action="store_true",
                         help="""Monitors forked processes creating individual plots for each child (disables --python features)""")
     parser.add_argument("--output", "-o", dest="filename",
-                        default="mprofile_<YYYYMMDDhhmmss>.dat",
-                        help="""File to store results in, defaults to 'mprofile_<YYYYMMDDhhmmss>.dat',
-(where <YYYYMMDDhhmmss> is the date-time of the program start)""")
+                        default="mprofile_%s.dat" % time.strftime("%Y%m%d%H%M%S", time.localtime()),
+                        help="""File to store results in, defaults to 'mprofile_<YYYYMMDDhhmmss>.dat' in the current directory,
+(where <YYYYMMDDhhmmss> is the date-time of the program start).
+This file contains the process memory consumption, in Mb (one value per line).""")
     parser.add_argument("program", nargs=REMAINDER,
                         help='Option 1: "<EXECUTABLE> <ARG1> <ARG2>..." - profile executable\n'
                              'Option 2: "<PYTHON_SCRIPT> <ARG1> <ARG2>..." - profile python script\n'
@@ -206,16 +207,7 @@ def run_action():
     print("{1}: Sampling memory every {0}s".format(
         args.interval, osp.basename(sys.argv[0])))
 
-    if args.filename is None:
-        ## Output results in a file called "mprofile_<YYYYMMDDhhmmss>.dat" (where
-        ## <YYYYMMDDhhmmss> is the date-time of the program start) in the current
-        ## directory. This file contains the process memory consumption, in Mb (one
-        ## value per line). Memory is sampled twice each second."""
-
-        suffix = time.strftime("%Y%m%d%H%M%S", time.localtime())
-        mprofile_output = "mprofile_%s.dat" % suffix
-    else:
-        mprofile_output = args.filename
+    mprofile_output = args.filename
 
     # .. TODO: more than one script as argument ? ..
     program = args.program