diff --git a/src/test/fuzz/fuzz_multi.sh b/src/test/fuzz/fuzz_multi.sh
index b7f59512db..406ab498d9 100755
--- a/src/test/fuzz/fuzz_multi.sh
+++ b/src/test/fuzz/fuzz_multi.sh
@@ -8,9 +8,9 @@ if [ $# -ge 1 ]; then
     shift
 fi
 
-FILTER=echo
+FILTER="echo"
 
-for i in `seq -w "$N_CPUS"`; do
+for i in $(seq -w "$N_CPUS"); do
     if [ "$i" -eq 1 ]; then
         if [ "$N_CPUS" -eq 1 ]; then
             INSTANCE=""