diff --git a/tools/regression_test.sh b/tools/regression_test.sh
index 568c8d2ce..4fa6d87b8 100755
--- a/tools/regression_test.sh
+++ b/tools/regression_test.sh
@@ -242,7 +242,7 @@ function run_db_bench {
 
   seek_nexts=$SEEK_NEXTS
   if [ "$async_io" == "true" ]; then
-    $seek_nexts=$SEEK_NEXTS_ASYNCIO
+    seek_nexts=$SEEK_NEXTS_ASYNCIO
   fi