diff --git a/docker/start.sh b/docker/start.sh
index 87db13c..916299c 100644
--- a/docker/start.sh
+++ b/docker/start.sh
@@ -66,7 +66,7 @@ setup_simulavr(){
 
 build_simulavr(){
     file="${HOME}/simulavr/build/pysimulavr/_pysimulavr.*.so"
-    [ "$(ls "$file"  2> /dev/null)" ] && return
+    [ "$(ls $file  2> /dev/null)" ] && return
     echo "##### Building Simulavr ..."
     cd ~/simulavr || exit 1
     make clean && make python && make build