diff --git a/.ci/validate_environment.sh b/.ci/validate_environment.sh
index 104a820a07cadf21c3ccc293c0dbebba1282ec73..c3e2906d78dbcf92a1b605ec3d7871d27dd72ba0 100755
--- a/.ci/validate_environment.sh
+++ b/.ci/validate_environment.sh
@@ -31,6 +31,7 @@ if [ "${CONTAINER_BUILD_TYPE}" = "testing" ]; then
     fi
 fi
 
+export SPACK_VERBOSE=
 # source file for early validation
 SOURCE_DIR="$(dirname "$(readlink -m "${BASH_SOURCE[0]}")")"
 source "${SOURCE_DIR}/commons.sh"