diff --git a/scripts/check-cxx-interop-compatibility.sh b/scripts/check-cxx-interop-compatibility.sh
index 5ad33a609c..9e868e94b5 100755
--- a/scripts/check-cxx-interop-compatibility.sh
+++ b/scripts/check-cxx-interop-compatibility.sh
@@ -33,7 +33,7 @@ swift package init
 
 {
   echo "let swiftSettings: [SwiftSetting] = [.interoperabilityMode(.Cxx)]"
-  echo "for target in package.targets { target.swiftSettings = swiftSettings }"
+  echo "for target in package.targets { target.swiftSettings = (target.swiftSettings ?? []) + swiftSettings }"
 } >> Package.swift
 
 echo "package.dependencies.append(.package(path: \"$source_dir\"))" >> Package.swift