diff --git a/examples/wrappers/rr.sh b/examples/wrappers/rr.sh
index a7a3f7fcf76b8b81cfac45561b309c7489fada2f..0f258c54db8611db48105f33d54faae716474220 100755
--- a/examples/wrappers/rr.sh
+++ b/examples/wrappers/rr.sh
@@ -3,7 +3,7 @@
 # Record deterministic execution using rr (http://rr-project.org)
 #
 
-export _RR_TRACE_DIR=$AVOCADO_TEST_OUTPUTDIR/rr
-mkdir -p $_RR_TRACE_DIR
+export _RR_TRACE_DIR="$AVOCADO_TEST_OUTPUTDIR/rr"
+mkdir -p "$_RR_TRACE_DIR"
 exec rr record -n "$@"