diff --git a/include/library/stdlib.h b/include/library/stdlib.h
index 875e077..b34df25 100644
--- a/include/library/stdlib.h
+++ b/include/library/stdlib.h
@@ -3,4 +3,7 @@
 
 void exit( int code );
 
+#ifdef LIBRARY_STDLIB_EXT
+  #include "library_stdlib_ext.h"
+#endif
 #endif