diff --git a/cpp/setup_build_env.sh b/cpp/setup_build_env.sh
index e9901bdbecd42..26a727c87e526 100755
--- a/cpp/setup_build_env.sh
+++ b/cpp/setup_build_env.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-SOURCE_DIR=$(cd "$(dirname "$BASH_SOURCE")"; pwd)
+SOURCE_DIR=$(cd "$(dirname "${BASH_SOURCE:-$0}")"; pwd)
 
 ./thirdparty/download_thirdparty.sh
 ./thirdparty/build_thirdparty.sh
diff --git a/cpp/thirdparty/build_thirdparty.sh b/cpp/thirdparty/build_thirdparty.sh
index 46794def400eb..8de56a6d08678 100755
--- a/cpp/thirdparty/build_thirdparty.sh
+++ b/cpp/thirdparty/build_thirdparty.sh
@@ -2,7 +2,7 @@
 
 set -x
 set -e
-TP_DIR=$(cd "$(dirname "$BASH_SOURCE")"; pwd)
+TP_DIR=$(cd "$(dirname "${BASH_SOURCE:-$0}")"; pwd)
 
 source $TP_DIR/versions.sh
 PREFIX=$TP_DIR/installed
diff --git a/cpp/thirdparty/download_thirdparty.sh b/cpp/thirdparty/download_thirdparty.sh
index 8ffb22a93f7e2..0c801179e8d30 100755
--- a/cpp/thirdparty/download_thirdparty.sh
+++ b/cpp/thirdparty/download_thirdparty.sh
@@ -3,7 +3,7 @@
 set -x
 set -e
 
-TP_DIR=$(cd "$(dirname "$BASH_SOURCE")"; pwd)
+TP_DIR=$(cd "$(dirname "${BASH_SOURCE:-$0}")"; pwd)
 
 source $TP_DIR/versions.sh