diff --git a/packages/api/core/src/util/upgrade-forge-config.ts b/packages/api/core/src/util/upgrade-forge-config.ts
index 9f3b3111e6..d20e058796 100644
--- a/packages/api/core/src/util/upgrade-forge-config.ts
+++ b/packages/api/core/src/util/upgrade-forge-config.ts
@@ -80,7 +80,7 @@ function generateForgeMakerConfig(forge5Config: Forge5Config): IForgeResolvableM
       makers.push({
         name: `@electron-forge/maker-${makerType}`,
         config: forge5Config[forge5Key],
-        platforms: makeTargets.get(makerType) || null,
+        platforms: makeTargets.get(makerType) || [],
       } as IForgeResolvableMaker);
     }
   }