diff --git a/compareECLFiles.cmake b/compareECLFiles.cmake
index ef20742a5..b6bdfd39c 100755
--- a/compareECLFiles.cmake
+++ b/compareECLFiles.cmake
@@ -490,6 +490,14 @@ add_test_compareECLFiles(CASENAME udq_wconprod
                          REL_TOL ${rel_tol}
                          DIR udq_actionx)
 
+add_test_compareECLFiles(CASENAME actionx_m1
+                         FILENAME ACTIONX_M1
+                         SIMULATOR flow
+                         ABS_TOL ${abs_tol}
+                         REL_TOL ${rel_tol}
+                         DIR udq_actionx
+                         TEST_ARGS --solver-max-time-step-in-days=1)
+
 add_test_compareECLFiles(CASENAME pinch_multz_all
                          FILENAME PINCH_MULTZ_ALL
                          SIMULATOR flow
diff --git a/tests/update_reference_data.sh b/tests/update_reference_data.sh
index 84fe14242..1d6d83730 100755
--- a/tests/update_reference_data.sh
+++ b/tests/update_reference_data.sh
@@ -131,6 +131,7 @@ tests[polymer_injectivity]="flow polymer_injectivity 2D_POLYMER_INJECTIVITY"
 tests[nnc]="flow editnnc NNC_AND_EDITNNC"
 tests[udq_wconprod]="flow udq_actionx UDQ_WCONPROD"
 tests[udq_actionx]="flow udq_actionx UDQ_ACTIONX"
+tests[actionx_m1]="flow udq_actionx ACTIONX_M1"
 tests[udq_uadd]="flow udq_actionx UDQ_M1"
 tests[udq_undefined]="flow udq_actionx UDQ_M2"
 tests[udq_in_actionx]="flow udq_actionx UDQ_M3"