diff --git a/signalgen.py b/signalgen.py
index 2505194..edea711 100755
--- a/signalgen.py
+++ b/signalgen.py
@@ -249,7 +249,7 @@ if __name__ == "__main__":
 		"-d", "--dm", dest="dm", type=float, help="DM of injected pulse."
 	)
 	parser.add_argument(
-		"-w", "--width", dest=pWidth, type=float, help="Width of desired pulse in seconds."
+		"-w", "--width", dest="pWidth", type=float, help="Width of desired pulse in seconds."
 	)
 	parser.add_argument(
 		"-n", "--nsamp", type=int, help="Number of samples to take of the generated pulse."