diff --git a/melodic.tcl b/melodic.tcl
index b67afae2e5bbcb49b75de17b7cd9e44706decfe5..0e00d5de982b6c3438aa960002bb5be98ca7e752 100644
--- a/melodic.tcl
+++ b/melodic.tcl
@@ -473,7 +473,7 @@ if { $fmri(st) > 0 } {
 #{{{ BET
 
 if { $fmri(bet_yn) } {
-    fsl:exec "${FSLDIR}/bin/betfunc $INPUT prefiltered_func_data_bet"
+    fsl:exec "${FSLDIR}/bin/bet $INPUT prefiltered_func_data_bet -F"
     set INPUT prefiltered_func_data_bet
 }