diff --git a/package-lock.json b/package-lock.json
index 99712db3..7612500f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "pg-mem",
-  "version": "2.8.0",
+  "version": "2.8.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "pg-mem",
-      "version": "2.8.0",
+      "version": "2.8.1",
       "license": "MIT",
       "dependencies": {
         "functional-red-black-tree": "^1.0.1",
diff --git a/package.json b/package.json
index 7f36a8c5..325fa9f0 100644
--- a/package.json
+++ b/package.json
@@ -153,4 +153,4 @@
     "instrument": false,
     "sourceMap": false
   }
-}
\ No newline at end of file
+}
diff --git a/src/adapters/adapters.ts b/src/adapters/adapters.ts
index a43422e8..303b1c23 100644
--- a/src/adapters/adapters.ts
+++ b/src/adapters/adapters.ts
@@ -157,7 +157,7 @@ export class Adapters implements LibAdapters {
                     };
                 } else {
                     // clean copy to avoid mutating things outside our scope
-                    query = { ...query };
+                    query = { ...query, values: query.values || values };
                 }
                 if (!query.values?.length) {
                     return query;