diff --git a/build.sh b/build.sh
index 87e12dcfd7..91e1692412 100755
--- a/build.sh
+++ b/build.sh
@@ -2,7 +2,7 @@
 set -e
 set -x
 
-if [ ! -d "csources" ]; then
+if [ ! -e csources/.git ]; then
 	git submodule update --init --depth 1
 fi