diff --git a/CHANGELOG.md b/CHANGELOG.md
index f8d6d3b8..30aed888 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,10 @@ Fixed
 * Exception messages.
 * Null pointer handling.
 
+Removed
+-------
+* `ARILES_CPP_STANDARD` cmake option.
+
 
 2.1.0
 =====
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3ad4332a..6d332d87 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,6 @@ option (ARILES_VERBOSE                  "Verbose build"                     ON)
 option (ARILES_BUILD_REGRESSION_TESTS   "Build regression tests."           ON)
 option (ARILES_CCACHE                   "Enable ccache if available"        ON)
 set    (ARILES_DEB_TARGETS              "" CACHE STRING "Enable debian package generation.")
-set    (ARILES_CPP_STANDARD             "17" CACHE STRING "must not be older than 17")
 
 # install parameters
 set    (ARILES_PKGCONFIG_INSTALL_PATH   "" CACHE STRING "pkg-config pc-file install path, not installed if empty")
@@ -210,10 +209,12 @@ set(CMAKEUT_CPP_SANITIZERS  ${ARILES_CPP_SANITIZERS})
 set(CMAKEUT_CLANG_TIDY      ${ARILES_CPP_CLANG_TIDY})
 set(CMAKEUT_CLANG_TIDY_EXTRA_IGNORES
     "-cppcoreguidelines-special-member-functions,-hicpp-special-member-functions,-altera-struct-pack-align,-llvm-namespace-comment,-misc-no-recursion,-readability-const-return-type,-google-default-arguments,-bugprone-macro-parentheses,-cppcoreguidelines-pro-type-union-access,-hicpp-named-parameter,-readability-named-parameter,-cppcoreguidelines-pro-bounds-pointer-arithmetic,-cppcoreguidelines-pro-type-union-access,-cppcoreguidelines-avoid-non-const-global-variables,-cert-err58-cpp,-cert-env33-c")
-cmakeut_compiler_flags("c++${ARILES_CPP_STANDARD}")
+set(CMAKE_CXX_STANDARD "17")
+cmakeut_compiler_flags("c++${CMAKE_CXX_STANDARD}")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKEUT_CXX_FLAGS}")
 
 
+
 set (RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/bin")
 set (LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib")
 set (ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib")