diff --git a/generators/base-core/generator.ts b/generators/base-core/generator.ts
index 1a5021feace..70a376e0f1f 100644
--- a/generators/base-core/generator.ts
+++ b/generators/base-core/generator.ts
@@ -644,7 +644,7 @@ You can ignore this error by passing '--skip-checks' to jhipster command.`);
         now = control.reproducibleLiquibaseTimestamp;
       } else {
         // Create a new counter
-        const newCreationTimestamp = creationTimestamp ?? this.config.get('creationTimestamp');
+        const newCreationTimestamp: string = (creationTimestamp as string) ?? this.config.get('creationTimestamp');
         now = newCreationTimestamp ? new Date(newCreationTimestamp) : now;
         now.setMilliseconds(0);
       }
diff --git a/generators/javascript/generators/bootstrap/generator.ts b/generators/javascript/generators/bootstrap/generator.ts
index 770a25f0644..889cffdf8ff 100644
--- a/generators/javascript/generators/bootstrap/generator.ts
+++ b/generators/javascript/generators/bootstrap/generator.ts
@@ -80,7 +80,7 @@ export default class BootstrapGenerator extends BaseApplicationGenerator {
         }
         if (packageJsonNodeEngine) {
           this.packageJson.set('engines', {
-            ...(this.packageJson.get('engines') ?? {}),
+            ...((this.packageJson.get('engines') as object) ?? {}),
             node: typeof packageJsonNodeEngine === 'string' ? packageJsonNodeEngine : packageJson.engines.node,
           });
         }