diff --git a/libsanitizer/merge.sh b/libsanitizer/merge.sh
index 95ded4f96344..7d1b553e2bb7 100755
--- a/libsanitizer/merge.sh
+++ b/libsanitizer/merge.sh
@@ -6,7 +6,7 @@
 
 get_upstream() {
   rm -rf upstream
-  git clone https://github.com/llvm/llvm-project.git upstream
+  git clone --depth 1 https://github.com/llvm/llvm-project.git upstream
 }
 
 get_current_rev() {