diff --git a/systemtap-static-probes-in-ruby/runtest.sh b/systemtap-static-probes-in-ruby/runtest.sh
index af0e14f..87f0bae 100755
--- a/systemtap-static-probes-in-ruby/runtest.sh
+++ b/systemtap-static-probes-in-ruby/runtest.sh
@@ -38,7 +38,7 @@ if [ -z "$COLLECTIONS" ]; then
 fi
 REQUIRES=${REQUIRES:-}
 RUBY=${RUBY:-ruby}
-_STAP_FILE="`rpm -ql $PACKAGES | grep 'ruby-exercise.stp' 2>/dev/null`"
+_STAP_FILE="${_STAP_FILE:-/usr/share/doc/ruby-doc/ruby-exercise.stp}"
 _LOG_FILE="ruby.log"
 _STAP_OUT="stap-out.log"