--- a/setup.py
+++ b/setup.py
@@ -206,7 +206,7 @@ class PillowHeifBuildExt(build_ext):
             self._add_directory(library_dirs, "/usr/lib")
             self._add_directory(library_dirs, "/lib")
 
-            self._update_extension("_pillow_heif", ["heif"], extra_compile_args=["-O3", "-Werror"])
+            self._update_extension("_pillow_heif", ["heif"])
 
         self.compiler.library_dirs = library_dirs + self.compiler.library_dirs
         self.compiler.include_dirs = include_dirs + self.compiler.include_dirs