diff --git a/README.md b/README.md
index 5f34293cb..a8684c983 100644
--- a/README.md
+++ b/README.md
@@ -84,7 +84,7 @@ For more commands type:
 ```
 $ git clone https://github.com/deltachat/deltachat-core-rust.git
 $ cd deltachat-core-rust
-$ cmake -B build .
+$ cmake -B build . -DCMAKE_INSTALL_PREFIX=/usr
 $ cmake --build build
 $ sudo cmake --install build
 ```