diff --git a/ccp4i/scripts/superpose.script b/ccp4i/scripts/superpose.script
index 3483c97..5027536 100755
--- a/ccp4i/scripts/superpose.script
+++ b/ccp4i/scripts/superpose.script
@@ -21,7 +21,7 @@
 
   if { [regexp SSM $SUPERPOSE_MODE ] } {
 
-    set cmd "[BinPath superpose] \"$XYZIN2\" -s $SSM_MOVING \"$XYZIN1\" -s $SSM_FIXED \"$XYZOUT_LOCAL\""
+    set cmd "[BinPath superpose-ccp4] \"$XYZIN2\" -s $SSM_MOVING \"$XYZIN1\" -s $SSM_FIXED \"$XYZOUT_LOCAL\""
     set status [Execute $cmd "" program_status report ]
 
   } elseif { [regexp TOP $SUPERPOSE_MODE ] } {
diff --git a/ccp4i/tasks/superpose.tcl b/ccp4i/tasks/superpose.tcl
index 748bf6e..c92122a 100755
--- a/ccp4i/tasks/superpose.tcl
+++ b/ccp4i/tasks/superpose.tcl
@@ -100,7 +100,7 @@ proc superpose_run { arrayname } {
 # If user is match equivalent named residues/atoms then fit in the match fields
   switch [GetValue $arrayname SUPERPOSE_MODE] \
   SSM {
-    if { ![file exists [FindExecutable superpose]] } {
+    if { ![file exists [FindExecutable superpose-ccp4]] } {
        WarningMessage "The program \"superpose\" is not on your path. 
 Check your installation for \"superpose\" program and \"ssm\" library."
        return 0