diff --git a/appveyor.yml b/appveyor.yml
index 17215931..80d5e65b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -252,8 +252,8 @@
       C:\cygwin64\bin\bash --login -c "
         set -e;
         cd build/cmake;
-        CFLAGS='-Werror' cmake -G 'Unix Makefiles' -DCMAKE_BUILD_TYPE=Debug -DZSTD_BUILD_TESTS:BOOL=ON -DZSTD_FUZZER_FLAGS=-T30s -DZSTD_ZSTREAM_FLAGS=-T30s .;
-        make -j4;
+        CFLAGS='-O1 -Werror' cmake -G 'Unix Makefiles' -DCMAKE_BUILD_TYPE=Debug -DZSTD_BUILD_TESTS:BOOL=ON -DZSTD_FUZZER_FLAGS=-T20s -DZSTD_ZSTREAM_FLAGS=-T20s -DZSTD_FULLBENCH_FLAGS=-i0 .;
+        make VERBOSE=1 -j4;
         ctest -V -L Medium;
       "
     )
diff --git a/build/cmake/tests/CMakeLists.txt b/build/cmake/tests/CMakeLists.txt
index 34eca910..fe095eb6 100644
--- a/build/cmake/tests/CMakeLists.txt
+++ b/build/cmake/tests/CMakeLists.txt
@@ -58,7 +58,7 @@ target_link_libraries(datagen libzstd_static)
 #
 add_executable(fullbench ${PROGRAMS_DIR}/datagen.c ${PROGRAMS_DIR}/util.c ${PROGRAMS_DIR}/timefn.c ${PROGRAMS_DIR}/benchfn.c ${PROGRAMS_DIR}/benchzstd.c ${TESTS_DIR}/fullbench.c)
 target_link_libraries(fullbench libzstd_static)
-add_test(NAME fullbench COMMAND fullbench)
+add_test(NAME fullbench COMMAND fullbench ${ZSTD_FULLBENCH_FLAGS})
 
 #
 # fuzzer