diff --git a/code/constitutive_nonlocal.f90 b/code/constitutive_nonlocal.f90
index 5e215445f..d902f2721 100644
--- a/code/constitutive_nonlocal.f90
+++ b/code/constitutive_nonlocal.f90
@@ -956,7 +956,7 @@ do i = 1,maxNinstance
   
   Cslip66(:,:,i) = lattice_symmetrizeC66(constitutive_nonlocal_structureName(i), Cslip66(:,:,i)) 
   mu(i) = 0.2_pReal * ( Cslip66(1,1,i) - Cslip66(1,2,i) + 3.0_pReal*Cslip66(4,4,i))                 ! (C11iso-C12iso)/2 with C11iso=(3*C11+2*C12+4*C44)/5 and C12iso=(C11+4*C12-2*C44)/5
-  nu(i) = (Cslip66(1,1,i) + 4.0_pReal*Cslip66(1,2,i) - 2.0_pReal*Cslip66(1,2,i)) &
+  nu(i) = (Cslip66(1,1,i) + 4.0_pReal*Cslip66(1,2,i) - 2.0_pReal*Cslip66(4,4,i)) &
         / (4.0_pReal*Cslip66(1,1,i) + 6.0_pReal*Cslip66(1,2,i) + 2.0_pReal*Cslip66(4,4,i))          ! C12iso/(C11iso+C12iso) with C11iso=(3*C11+2*C12+4*C44)/5 and C12iso=(C11+4*C12-2*C44)/5
   Cslip66(1:6,1:6,i) = math_Mandel3333to66(math_Voigt66to3333(Cslip66(1:6,1:6,i)))
   Cslip3333(1:3,1:3,1:3,1:3,i) = math_Voigt66to3333(Cslip66(1:6,1:6,i))