diff --git a/README.md b/README.md
index 1ae43ff4..41f3bf00 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ as described below.
 brew install openssl
 export OPENSSL_INCLUDE_DIR=`brew --prefix openssl`/include
 export OPENSSL_LIB_DIR=`brew --prefix openssl`/lib
+cargo clean
 ```
 
 ### Windows