diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9e2446547..dae208e5f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Added
 - Added number of levels with clouds for photolysis to geoschem_config.yml and Input_Opt to pass to Cloud-J
 - Added `State_Grid%CPU_Subdomain_ID` and `State_Grid%CPU_Subdomain_FirstID` as "identifier numbers" for multiple instances of GEOS-Chem on one core in WRF and CESM
+- Added simulation with all diagnostics on in HISTORY.rc to integration tests for GCClassic
 
 ### Changed
 - Now reset `State_Diag%SatDiagnCount` to zero in routine`History_Write` (instead of in `History_Netcdf_Write`)
diff --git a/test/integration/GCClassic/integrationTestCreate.sh b/test/integration/GCClassic/integrationTestCreate.sh
index 48ccd518a..a243f1fe7 100755
--- a/test/integration/GCClassic/integrationTestCreate.sh
+++ b/test/integration/GCClassic/integrationTestCreate.sh
@@ -295,8 +295,17 @@ if [[ "X${testsToRun}" == "XALL" ]]; then
     # 05x0625 merra2 fullchem_47L_na
     create_rundir "1\n1\n1\n3\n4\n2\n${rundirsDir}\n\nn\n" "${log}"
 
+    #=========================================================================
+    # Simulation with all diagnostics on
+    #==========================================================================
+
+    cd ${rundirsDir}/
+    cp -r gc_4x5_merra2_fullchem_benchmark gc_4x5_merra2_fullchem_alldiags
+    sed_ie "s|#'|'|"  gc_4x5_merra2_fullchem_alldiags/HISTORY.rc
+
     # Switch back to the present directory
     cd "${thisDir}"
+
 fi
 
 #=============================================================================