diff --git a/packages/client-engine-runtime/src/interpreter/generators.ts b/packages/client-engine-runtime/src/interpreter/generators.ts
index 2fac994fd513..e1f4a972594b 100644
--- a/packages/client-engine-runtime/src/interpreter/generators.ts
+++ b/packages/client-engine-runtime/src/interpreter/generators.ts
@@ -45,9 +45,12 @@ export interface ValueGenerator {
 }
 
 class NowGenerator implements ValueGenerator {
-  #now: Date = new Date()
+  #now: Date | undefined
 
   generate(): string {
+    if (this.#now === undefined) {
+      this.#now = new Date()
+    }
     return this.#now.toISOString()
   }
 }