diff --git a/cmake/ci.cmake b/cmake/ci.cmake
index d07ab920c..936ce0386 100644
--- a/cmake/ci.cmake
+++ b/cmake/ci.cmake
@@ -95,6 +95,7 @@ file(GLOB_RECURSE SRC_FILES ${PROJECT_SOURCE_DIR}/include/nlohmann/*.hpp)
 # -Wno-extra-semi-stmt            The library uses std::assert which triggers this warning.
 # -Wno-padded                     We do not care about padding warnings.
 # -Wno-covered-switch-default     All switches list all cases and a default case.
+# -Wno-unsafe-buffer-usage        Otherwise Doctest would not compile.
 # -Wno-weak-vtables               The library is header-only.
 # -Wreserved-identifier           See https://github.com/onqtam/doctest/issues/536.
 
@@ -107,6 +108,7 @@ set(CLANG_CXXFLAGS
     -Wno-extra-semi-stmt
     -Wno-padded
     -Wno-covered-switch-default
+    -Wno-unsafe-buffer-usage
     -Wno-weak-vtables
     -Wno-reserved-identifier
 )