diff --git a/org/qmckl_jastrow_champ.org b/org/qmckl_jastrow_champ.org
index 0696a0c..1f1dbad 100644
--- a/org/qmckl_jastrow_champ.org
+++ b/org/qmckl_jastrow_champ.org
@@ -5685,7 +5685,7 @@ qmckl_exit_code qmckl_compute_een_rescaled_e_hpc (
 #endif
   for (size_t nw = 0; nw < (size_t) walk_num; ++nw) {
 
-    double een_rescaled_e_ij[len_een_ij];
+    double* een_rescaled_e_ij = malloc(len_een_ij*sizeof(double));
 
     memset(&(een_rescaled_e_ij[0]),0,len_een_ij*sizeof(double));
     for (size_t kk = 0; kk < elec_pairs ; ++kk) {
@@ -5754,6 +5754,7 @@ qmckl_exit_code qmckl_compute_een_rescaled_e_hpc (
       }
     }
 
+    free(een_rescaled_e_ij);
   }
 
   return QMCKL_SUCCESS;