diff --git a/appveyor.yml b/appveyor.yml
index dc80e1c..5972e3c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -20,23 +20,14 @@ environment:
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
     GENERATOR: "Visual Studio 15 2017"
     GROUP: "SUPPORTED"
-    BUILD_CONFIG: "Release"
     BOOST_ROOT: "C:/Libraries/boost_1_67_0"
+
     PLATFORM: "win32"
     REF_BUILD_ID: "220dev5"
   # New build on Visual Studio 15 2017
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
     GENERATOR: "Visual Studio 15 2017 Win64"
     GROUP: "EXPERIMENTAL"
-    BUILD_CONFIG: "Release"
-    BOOST_ROOT: "C:/Libraries/boost_1_67_0"
-    PLATFORM: "win64"
-    REF_BUILD_ID: "381_2"
-  # adding debug configuration so we can monitor memory leaks
-  - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-    GENERATOR: "Visual Studio 15 2017 Win64"
-    GROUP: "EXPERIMENTAL"
-    BUILD_CONFIG: "Debug"
     BOOST_ROOT: "C:/Libraries/boost_1_67_0"
     PLATFORM: "win64"
     REF_BUILD_ID: "381_2"
@@ -69,7 +60,7 @@ before_build:
 
 # run custom build script
 build_script:
-  - cmake --build . --config %BUILD_CONFIG%
+  - cmake --build . --config Release
 
 before_test:
   - cd %EPANET_HOME%
@@ -79,12 +70,11 @@ before_test:
 test_script:
   # run unit tests
   - cd %BUILD_HOME%\tests
-  - ctest -C %BUILD_CONFIG% --output-on-failure
+  - ctest -C Release --output-on-failure
   # run regression tests
   - cd %EPANET_HOME%
-  - IF "%BUILD_CONFIG%" == "Release" (
-      tools\run-nrtest.cmd %REF_BUILD_ID% %SUT_BUILD_ID%
-    )
+  - tools\run-nrtest.cmd %REF_BUILD_ID% %SUT_BUILD_ID%
+
 on_success:
   - cd %TEST_HOME%\benchmark
   - IF "%BUILD_CONFIG%" == "Release" (
@@ -98,4 +88,3 @@ on_failure:
       7z a benchmark-%PLATFORM%-%SUT_BUILD_ID%.zip .\epanet-%SUT_BUILD_ID% &
       appveyor PushArtifact benchmark-%PLATFORM%-%SUT_BUILD_ID%.zip
     )
-