diff --git a/src/libs/libcxx.zig b/src/libs/libcxx.zig
index 3c296d477ff9e73cc734c31498d0ee84c27e8a40..4e39d1e03a8daff279bda98ea642be5f2dc06fa1 100644
--- a/src/libs/libcxx.zig
+++ b/src/libs/libcxx.zig
@@ -556,5 +556,4 @@ pub fn addCxxArgs(
             try cflags.append("-D_LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION=0");
         }
     }
-    try cflags.append("-D_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS");
 }