diff --git a/config/gfortran.cfg b/config/gfortran.cfg
index b713aaf0..6e69033c 100644
--- a/config/gfortran.cfg
+++ b/config/gfortran.cfg
@@ -10,7 +10,7 @@
 #
 #
 [COMMON]
-FC           : gfortran -g -ffree-line-length-none -I . -static-libgcc 
+FC           : gfortran -mavx -g -ffree-line-length-none -I . -static-libgcc 
 LAPACK_LIB   : -llapack -lblas
 IRPF90       : irpf90
 IRPF90_FLAGS : --ninja --align=32
@@ -22,7 +22,7 @@ IRPF90_FLAGS : --ninja --align=32
 # 0 : Deactivate
 #
 [OPTION]
-MODE    : DEBUG        ; [ OPT | PROFILE | DEBUG ] : Chooses the section below
+MODE    : OPT        ; [ OPT | PROFILE | DEBUG ] : Chooses the section below
 CACHE   : 1          ; Enable cache_compile.py
 OPENMP  : 1          ; Append OpenMP flags
 
diff --git a/src/Determinants/H_apply.template.f b/src/Determinants/H_apply.template.f
index 58ae8b08..2611fb12 100644
--- a/src/Determinants/H_apply.template.f
+++ b/src/Determinants/H_apply.template.f
@@ -108,13 +108,13 @@ subroutine $subroutine_diexcP(key_in, fs1, fh1, particl_1, fs2, fh2, particl_2,
   
   p1_mask(:,:) = 0_bit_kind
   p2_mask(:,:) = 0_bit_kind
-  p1_mask(ishft(fh1,-bit_kind_shift) + 1, fs1) = ishft(1,iand(fh1-1,bit_kind_size-1))
-  p2_mask(ishft(fh2,-bit_kind_shift) + 1, fs2) = ishft(1,iand(fh2-1,bit_kind_size-1))
+  p1_mask(ishft(fh1-1,-bit_kind_shift) + 1, fs1) = ishft(1_8,iand(fh1-1,bit_kind_size-1))
+  p2_mask(ishft(fh2-1,-bit_kind_shift) + 1, fs2) = ishft(1_8,iand(fh2-1,bit_kind_size-1))
   
   key_mask(:,:) = key_in(:,:)
 
-  key_mask(ishft(fh1,-bit_kind_shift) + 1, fs1) -= ishft(1,iand(fh1-1,bit_kind_size-1))
-  key_mask(ishft(fh2,-bit_kind_shift) + 1, fs2) -= ishft(1,iand(fh2-1,bit_kind_size-1))
+  key_mask(ishft(fh1-1,-bit_kind_shift) + 1, fs1) -= ishft(1_8,iand(fh1-1,bit_kind_size-1))
+  key_mask(ishft(fh2-1,-bit_kind_shift) + 1, fs2) -= ishft(1_8,iand(fh2-1,bit_kind_size-1))
 
   call $subroutine_diexcOrg(key_in, key_mask, p1_mask, particl_1, p2_mask, particl_2, fock_diag_tmp, i_generator, iproc_in $parameters )
 end subroutine