diff --git a/compareECLFiles.cmake b/compareECLFiles.cmake
index 7fde232aa..25dfab4d8 100755
--- a/compareECLFiles.cmake
+++ b/compareECLFiles.cmake
@@ -293,6 +293,13 @@ add_test_compareECLFiles(CASENAME faults_model_1
                          REL_TOL ${rel_tol}
                          DIR model1)
 
+add_test_compareECLFiles(CASENAME nnc
+                         FILENAME NNC_AND_EDITNNC
+                         SIMULATOR flow
+                         ABS_TOL ${abs_tol}
+                         REL_TOL ${rel_tol}
+                         DIR editnnc)
+
 # Restart tests
 opm_set_test_driver(${PROJECT_SOURCE_DIR}/tests/run-restart-regressionTest.sh "")
 
diff --git a/tests/update_reference_data.sh b/tests/update_reference_data.sh
index ada8cc193..5eb068965 100755
--- a/tests/update_reference_data.sh
+++ b/tests/update_reference_data.sh
@@ -53,6 +53,7 @@ tests[base_model_1]="flow model1 BASE_MODEL_1 base_model_1"
 tests[msw_model_1]="flow model1 MSW_MODEL_1 msw_model_1"
 tests[faults_model_1]="flow model1 FAULTS_MODEL_1 faults_model_1"
 tests[polymer_injectivity]="flow polymer_injectivity 2D_POLYMER_INJECTIVITY"
+tests[nnc]="flow editnnc NNC_AND_EDITNNC nnc"
 
 changed_tests=""
 for test_name in ${!tests[*]}