diff --git a/setup.py b/setup.py
index 54868fe..8ca5808 100644
--- a/setup.py
+++ b/setup.py
@@ -422,6 +422,7 @@
         exts.append( Extension("_functools", ["_functoolsmodule.c"]) )
         # Memory-based IO accelerator modules
         exts.append( Extension("_bytesio", ["_bytesio.c"]) )
+        exts.append( Extension("_stringio", ["_stringio.c"]) )
         # C-optimized pickle replacement
         exts.append( Extension("_pickle", ["_pickle.c"]) )
         # atexit