diff --git a/test/benchmarks/unixbench-5.1.2/run.sh b/test/benchmarks/unixbench-5.1.2/run.sh
index 2259753bf..4c3b4219b 100755
--- a/test/benchmarks/unixbench-5.1.2/run.sh
+++ b/test/benchmarks/unixbench-5.1.2/run.sh
@@ -1,4 +1,8 @@
 #!/bin/sh
 export CC=cc
 export MINIX=1
-./Run
+if perl -e 'exit 0'
+then	perl -w Run
+else	echo "perl not installed. please install perl to run unixbench." >&2
+	exit 1
+fi