diff --git a/src/field_routines.f90 b/src/field_routines.f90
index 0cfdb509..fd9e5bc0 100644
--- a/src/field_routines.f90
+++ b/src/field_routines.f90
@@ -22267,7 +22267,7 @@ SUBROUTINE FIELD_SCALINGS_CALCULATE(FIELD,ERR,ERROR,*)
                         nu1=PART_DERIV_S1
                         ni2=3
                         nu2=PART_DERIV_S3
-                      ELSE IF(partial_derivative_idx==PART_DERIV_S1_S2) THEN
+                      ELSE IF(partial_derivative_idx==PART_DERIV_S2_S3) THEN
                         ni1=2
                         nu1=PART_DERIV_S2
                         ni2=3