diff --git a/qa/zcash/performance-measurements.sh b/qa/zcash/performance-measurements.sh
index 7339609da..4b32ba146 100755
--- a/qa/zcash/performance-measurements.sh
+++ b/qa/zcash/performance-measurements.sh
@@ -1,4 +1,6 @@
 #!/bin/bash
+set -u
+
 
 DATADIR=./benchmark-datadir
 SHA256CMD="$(command -v sha256sum || echo shasum)"