diff --git a/source/module_elecstate/module_charge/charge_mixing.cpp b/source/module_elecstate/module_charge/charge_mixing.cpp
index 57083301b2..e327904d0e 100755
--- a/source/module_elecstate/module_charge/charge_mixing.cpp
+++ b/source/module_elecstate/module_charge/charge_mixing.cpp
@@ -504,7 +504,7 @@ void Charge_Mixing::mix_rho_recip(Charge* chr)
         {
             chr->rhog[0][ig] = rhog_magabs[ig]; // rhog
             double norm = std::sqrt(chr->rho[1][ig] * chr->rho[1][ig] + chr->rho[2][ig] * chr->rho[2][ig] + chr->rho[3][ig] * chr->rho[3][ig]);
-            if (abs(norm) < 1e-10) continue;
+            if (std::abs(norm) < 1e-10) continue;
             double rescale_tmp = rho_magabs[npw + ig] / norm; 
             chr->rho[1][ig] *= rescale_tmp;
             chr->rho[2][ig] *= rescale_tmp;