diff --git a/.kokoro/samples-test.sh b/.kokoro/samples-test.sh
index a91cbf5..5a81ec0 100755
--- a/.kokoro/samples-test.sh
+++ b/.kokoro/samples-test.sh
@@ -26,7 +26,9 @@ cd $(dirname $0)/..
 
 # Run a pre-test hook, if a pre-samples-test.sh is in the project
 if [ -f .kokoro/pre-samples-test.sh ]; then
+    set +x
     . .kokoro/pre-samples-test.sh
+    set -x
 fi
 
 npm install
diff --git a/.kokoro/system-test.sh b/.kokoro/system-test.sh
index a954b79..fd8f0b6 100755
--- a/.kokoro/system-test.sh
+++ b/.kokoro/system-test.sh
@@ -26,7 +26,9 @@ cd $(dirname $0)/..
 
 # Run a pre-test hook, if a pre-system-test.sh is in the project
 if [ -f .kokoro/pre-system-test.sh ]; then
+    set +x
     . .kokoro/pre-system-test.sh
+    set -x
 fi
 
 npm install