diff --git a/pypfopt/base_optimizer.py b/pypfopt/base_optimizer.py
new file mode 100644
index 00000000..4cb1d053
--- /dev/null
+++ b/pypfopt/base_optimizer.py
@@ -0,0 +1,9 @@
+"""Exports for _base_optimizer.py, for downwards compatibility."""
+
+from pypfopt.base._base_optimizer import (
+    BaseConvexOptimizer,
+    BaseOptimizer,
+    portfolio_performance,
+)
+
+__all__ = ["BaseOptimizer", "BaseConvexOptimizer", "portfolio_performance"]