diff --git a/thirdparty/scripts/build_arrow.sh b/thirdparty/scripts/build_arrow.sh
index bf6fc2bfe..0992526d5 100755
--- a/thirdparty/scripts/build_arrow.sh
+++ b/thirdparty/scripts/build_arrow.sh
@@ -45,7 +45,10 @@ build_arrow() {
     rm -rf $TP_DIR/build/arrow/cpp/build/CMakeCache.txt
   fi
 
-  if [[ ! -d $TP_DIR/build/arrow ]]; then
+  if [[ ! -d $TP_DIR/build/arrow/.git ]]; then
+    if [[ -d $TP_DIR/build/arrow ]]; then
+      rm -rf $TP_DIR/build/arrow
+    fi
     git clone -q https://github.com/apache/arrow.git "$TP_DIR/build/arrow"
   fi
 
diff --git a/thirdparty/scripts/build_parquet.sh b/thirdparty/scripts/build_parquet.sh
index caca4d1dd..8dc718a6b 100755
--- a/thirdparty/scripts/build_parquet.sh
+++ b/thirdparty/scripts/build_parquet.sh
@@ -50,7 +50,10 @@ build_parquet() {
   fi
 }
 
-if [ ! -d $TP_DIR/build/parquet-cpp ]; then
+if [ ! -d $TP_DIR/build/parquet-cpp/.git ]; then
+  if [[ -d $TP_DIR/build/parquet-cpp ]]; then
+      rm -rf $TP_DIR/build/parquet-cpp
+  fi
   git clone -q https://github.com/apache/parquet-cpp.git "$TP_DIR/build/parquet-cpp"
   pushd $TP_DIR/build/parquet-cpp
   git fetch origin master