diff --git a/Sources/SwiftBuildSupport/PackagePIFBuilder.swift b/Sources/SwiftBuildSupport/PackagePIFBuilder.swift
index 1d6a068b918..8196a16646f 100644
--- a/Sources/SwiftBuildSupport/PackagePIFBuilder.swift
+++ b/Sources/SwiftBuildSupport/PackagePIFBuilder.swift
@@ -584,7 +584,7 @@ public final class PackagePIFBuilder {
                 default:
                     .init(from: arm64ePlatform)
                 }
-                settings.platformSpecificSettings[pifPlatform]![.ARCHS] = ["arm64e"]
+                settings.platformSpecificSettings[pifPlatform]![.ARCHS, default: []].append(contentsOf: ["arm64e"])
             }
         }