diff --git a/src/mm_pbsa/mm_pbsa_createinput.pm b/src/mm_pbsa/mm_pbsa_createinput.pm
index 01dd911..74a8c6b 100644
--- src/mm_pbsa/mm_pbsa_createinput.pm
+++ src/mm_pbsa/mm_pbsa_createinput.pm
@@ -617,7 +617,7 @@ sub create_pbsa_input(){
     print OUT "  istrng = ${istrng},     radiopt = ${radiopt},\n";
     print OUT "  sprob  = ${sprob},     space   = ${space},\n";
     print OUT "  maxitn = ${maxitn},    dbfopt  = 1,\n";
-    print OUT "  cavity_surften = 1.0,    cavity_offset   = 0.0,\n";
+    print OUT "  cavity_surften = ${cavity_surften},    cavity_offset   = ${cavity_offset},\n";
     # Surften is set to 1.0, so SAS is calc itself
     #   -> calc of E(SAS) is done in statistics module
     print OUT "  npbverb= 1\n";