diff --git a/signalgen.py b/signalgen.py
index a34731a..22618f8 100755
--- a/signalgen.py
+++ b/signalgen.py
@@ -172,7 +172,7 @@ if __name__ == "__main__":
 		"-n", "--nsamp", type=int, help="Number of samples to take of the generated pulse."
 	)
 	parser.add_argument(
-		"-p", "--plot", type=bool, help="Just plot file and quit."
+		"-p", "--plot", action="store_true", help="Just plot file and quit."
 	)
 	parser.set_defaults(dm=250.0)
 	parser.set_defaults(nsamp=int(3e4))