diff --git a/README.md b/README.md
index acfac1b..114928c 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ mkdir build
 cd build
 cmake -DCMAKE_BUILD_TYPE=Release ..
 sudo make && sudo make install
-ldconfig
+sudo ldconfig
 
 git clone https://github.com/pierotofy/PotreeConverter /staging/PotreeConverter
 cd /staging/PotreeConverter