diff --git a/fsl/wrappers/bet.py b/fsl/wrappers/bet.py
index e20ee3fb13cb0070aca3b742b1946d34511106db..31660d122addd1f30fb0de857a97219d64f350f0 100644
--- a/fsl/wrappers/bet.py
+++ b/fsl/wrappers/bet.py
@@ -62,7 +62,7 @@ def bet(input, output, **kwargs):
     # passed as a Python sequence
     centre = kwargs.pop("c", None)
     if centre is not None:
-        cmd += ['c', ] + list(centre)
+        cmd += ['-c', ] + [str(v) for v in centre]
 
     cmd += wutils.applyArgStyle('-', argmap=argmap, valmap=valmap, **kwargs)