diff --git a/tests/certbot-boulder-integration.sh b/tests/certbot-boulder-integration.sh
index 9011d8ba3..630571148 100755
--- a/tests/certbot-boulder-integration.sh
+++ b/tests/certbot-boulder-integration.sh
@@ -174,7 +174,7 @@ CheckRenewHook() {
 TotalAndDistinctLines() {
     total=$1
     distinct=$2
-    awk '{a[$1] = 1}; END {exit(NR !='$total' || length(a) !='$distinct')}'
+    awk '{a[$1] = 1}; END {n = 0; for (i in a) { n++ }; exit(NR !='$total' || n !='$distinct')}'
 }
 
 # Cleanup coverage data