diff --git a/README b/README
index 385ee2c0a..45febc2f9 100644
--- a/README
+++ b/README
@@ -292,7 +292,7 @@ a recent version of gcc:
 This is a bug in the minisat header. It can be fixed by adding spaces before
 and after each occurrence of PRIi64 in the header file:
 
-	 sudo sed -i 's/PRIi64/ & /' /usr/include/minisat/utils/Options.h
+	 sudo sed -i -e 's/PRIi64/ & /' /usr/include/minisat/utils/Options.h
 
 
 Roadmap / Large-scale TODOs