diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c2049df79c212..002d260bb079f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -28,3 +28,5 @@ if (BUILD_SHARED_LIBS)
     set_target_properties(llama PROPERTIES POSITION_INDEPENDENT_CODE ON)
     target_compile_definitions(llama PRIVATE LLAMA_SHARED LLAMA_BUILD)
 endif()
+
+set_source_files_properties(unicode-data.cpp PROPERTIES COMPILE_FLAGS -O1)