diff --git a/tests/tools/onert_train/CMakeLists.txt b/tests/tools/onert_train/CMakeLists.txt
index 75dbd2fe352..8de7b9b0e1f 100644
--- a/tests/tools/onert_train/CMakeLists.txt
+++ b/tests/tools/onert_train/CMakeLists.txt
@@ -6,6 +6,10 @@ if(NOT BUILD_ONERT)
   return()
 endif(NOT BUILD_ONERT)
 
+# Use C++17 for onert_train
+# TODO: Remove this when we use C++17 for all runtime directories
+set(CMAKE_CXX_STANDARD 17)
+
 list(APPEND ONERT_TRAIN_SRCS "src/onert_train.cc")
 list(APPEND ONERT_TRAIN_SRCS "src/args.cc")
 list(APPEND ONERT_TRAIN_SRCS "src/nnfw_util.cc")