diff --git a/doc/build/build_from_source.md b/doc/build/build_from_source.md
index 5ab97d1e167990fc55bd513a8730750ed549d1bd..f4011dfe96a693d624fd50f466611cc231903273 100644
--- a/doc/build/build_from_source.md
+++ b/doc/build/build_from_source.md
@@ -70,7 +70,7 @@ sudo chmod a+r /usr/local/cuda/include/cudnn.h /usr/local/cuda/lib64/libcudnn*
 Then you need to set LD\_LIBRARY\_PATH, CUDA\_HOME and PATH environment variables in ~/.bashrc.
 
 ```bash
-export LD_LIBARAY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH
+export LD_LIBRARY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH
 export CUDA_HOME=/usr/local/cuda
 export PATH=/usr/local/cuda/bin:$PATH
 ```