diff --git a/src/eDFT/US51_lda_exchange_energy.f90 b/src/eDFT/US51_lda_exchange_energy.f90
index fbaaad9..5fe5d28 100644
--- a/src/eDFT/US51_lda_exchange_energy.f90
+++ b/src/eDFT/US51_lda_exchange_energy.f90
@@ -1,7 +1,5 @@
 subroutine US51_lda_exchange_energy(nGrid,weight,rho,Ex)
 
-  use xc_f90_lib_m
-
 ! Compute Slater's LDA exchange energy
 
   implicit none