diff --git a/.changeset/tough-roses-attend.md b/.changeset/tough-roses-attend.md
new file mode 100644
index 00000000000..59c43be4989
--- /dev/null
+++ b/.changeset/tough-roses-attend.md
@@ -0,0 +1,5 @@
+---
+"app-builder-lib": patch
+---
+
+fix: run nsis and portable builds sequentially. fixes #7791
diff --git a/packages/app-builder-lib/src/targets/nsis/NsisTarget.ts b/packages/app-builder-lib/src/targets/nsis/NsisTarget.ts
index 1685f4c7fd5..aab95bc2a8d 100644
--- a/packages/app-builder-lib/src/targets/nsis/NsisTarget.ts
+++ b/packages/app-builder-lib/src/targets/nsis/NsisTarget.ts
@@ -42,6 +42,7 @@ export class NsisTarget extends Target {
 
   /** @private */
   readonly archs: Map<Arch, string> = new Map()
+  readonly isAsyncSupported = false;
 
   constructor(readonly packager: WinPackager, readonly outDir: string, targetName: string, protected readonly packageHelper: AppPackageHelper) {
     super(targetName)