diff --git a/source/api_c/tests/test_deeppot_model_devi_fparam_aparam.cc b/source/api_c/tests/test_deeppot_model_devi_fparam_aparam.cc
index 9f808d8315..39bc1140d0 100644
--- a/source/api_c/tests/test_deeppot_model_devi_fparam_aparam.cc
+++ b/source/api_c/tests/test_deeppot_model_devi_fparam_aparam.cc
@@ -263,7 +263,7 @@ TYPED_TEST(TestInferDeepPotModeDeviFparamAparam, cpu_lmp_list_std) {
       for (int kk = 0; kk < nmodel; ++kk) {
         avg_f[dd] += fmd[kk][ii * 3 + dd];
       }
-      avg_f[dd] /= (nmodel)*1.0;
+      avg_f[dd] /= (nmodel) * 1.0;
     }
     VALUETYPE std = 0.;
     for (int kk = 0; kk < nmodel; ++kk) {
diff --git a/source/api_c/tests/test_deeppot_model_devi_hpp.cc b/source/api_c/tests/test_deeppot_model_devi_hpp.cc
index 30091c7a5b..75b0fab880 100644
--- a/source/api_c/tests/test_deeppot_model_devi_hpp.cc
+++ b/source/api_c/tests/test_deeppot_model_devi_hpp.cc
@@ -335,7 +335,7 @@ TYPED_TEST(TestInferDeepPotModeDevi, cpu_lmp_list_std) {
       for (int kk = 0; kk < nmodel; ++kk) {
         avg_f[dd] += fmd[kk][ii * 3 + dd];
       }
-      avg_f[dd] /= (nmodel)*1.0;
+      avg_f[dd] /= (nmodel) * 1.0;
     }
     VALUETYPE std = 0.;
     for (int kk = 0; kk < nmodel; ++kk) {
diff --git a/source/api_cc/tests/test_deeppot_model_devi.cc b/source/api_cc/tests/test_deeppot_model_devi.cc
index e28408319f..3ceba6a94e 100644
--- a/source/api_cc/tests/test_deeppot_model_devi.cc
+++ b/source/api_cc/tests/test_deeppot_model_devi.cc
@@ -330,7 +330,7 @@ TYPED_TEST(TestInferDeepPotModeDevi, cpu_lmp_list_std) {
       for (int kk = 0; kk < nmodel; ++kk) {
         avg_f[dd] += fmd[kk][ii * 3 + dd];
       }
-      avg_f[dd] /= (nmodel)*1.0;
+      avg_f[dd] /= (nmodel) * 1.0;
     }
     VALUETYPE std = 0.;
     for (int kk = 0; kk < nmodel; ++kk) {
diff --git a/source/api_cc/tests/test_deeppot_model_devi_fparam_aparam.cc b/source/api_cc/tests/test_deeppot_model_devi_fparam_aparam.cc
index 58060fc397..4647b30139 100644
--- a/source/api_cc/tests/test_deeppot_model_devi_fparam_aparam.cc
+++ b/source/api_cc/tests/test_deeppot_model_devi_fparam_aparam.cc
@@ -292,7 +292,7 @@ TYPED_TEST(TestInferDeepPotModeDeviFparamAparam, cpu_lmp_list_std) {
       for (int kk = 0; kk < nmodel; ++kk) {
         avg_f[dd] += fmd[kk][ii * 3 + dd];
       }
-      avg_f[dd] /= (nmodel)*1.0;
+      avg_f[dd] /= (nmodel) * 1.0;
     }
     VALUETYPE std = 0.;
     for (int kk = 0; kk < nmodel; ++kk) {