diff --git a/script/cpp_benchmark.py b/script/cpp_benchmark.py
index d4799388458..74878154027 100755
--- a/script/cpp_benchmark.py
+++ b/script/cpp_benchmark.py
@@ -53,6 +53,7 @@ def run_benchmarks(selected_components: list[str], build_only: bool = False) ->
         # CODSPEED_ROOT_DIR is used to display relative file paths in reports.
         project_root = Path(__file__).resolve().parent.parent
         codspeed_flags = [
+            "-DNDEBUG",
             "-DCODSPEED_ENABLED",
             "-DCODSPEED_ANALYSIS",
             f'-DCODSPEED_ROOT_DIR=\\"{project_root}\\"',
diff --git a/script/setup_codspeed_lib.py b/script/setup_codspeed_lib.py
index b34eed48162..b89f5ef7801 100755
--- a/script/setup_codspeed_lib.py
+++ b/script/setup_codspeed_lib.py
@@ -134,6 +134,7 @@ def _write_library_json(
                 f"-I{core_include}",
                 f"-I{hooks_include}",
                 # google benchmark build flags
+                "-DNDEBUG",
                 "-DHAVE_STD_REGEX",
                 "-DHAVE_STEADY_CLOCK",
                 "-DBENCHMARK_STATIC_DEFINE",