diff --git a/README.md b/README.md
index 759d4f7c..aeeff8a5 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ and then proceed with:
     git clone https://github.com/pbsa/peerplays.git
     cd peerplays
     git submodule update --init --recursive
-    cmake -DCMAKE_BUILD_TYPE=Release .
+    cmake -DBOOST_ROOT="$BOOST_ROOT" -DCMAKE_BUILD_TYPE=Release .
     make
     ./programs/witness_node/witness_node