diff --git a/test/Interop/Cxx/stdlib/libcxx-module-interface.swift b/test/Interop/Cxx/stdlib/libcxx-module-interface.swift
index b40dbd0cf16c7..98a90f9c17cc0 100644
--- a/test/Interop/Cxx/stdlib/libcxx-module-interface.swift
+++ b/test/Interop/Cxx/stdlib/libcxx-module-interface.swift
@@ -11,6 +11,9 @@
 // This test is specific to libc++ and therefore only runs on Darwin platforms.
 // REQUIRES: OS=macosx || OS=ios
 
+// Since this test runs check-libcxx-version, it requires execution.
+// REQUIRES: executable_test
+
 // CHECK-STD: import CxxStdlib.iosfwd
 // CHECK-STD: import CxxStdlib.string
 
diff --git a/test/Interop/Cxx/stdlib/libcxx-symbolic-module-interface.swift b/test/Interop/Cxx/stdlib/libcxx-symbolic-module-interface.swift
index abacc46823cab..7a9b0739c074c 100644
--- a/test/Interop/Cxx/stdlib/libcxx-symbolic-module-interface.swift
+++ b/test/Interop/Cxx/stdlib/libcxx-symbolic-module-interface.swift
@@ -11,6 +11,9 @@
 // REQUIRES: OS=macosx
 // REQUIRES: swift_feature_ImportSymbolicCXXDecls
 
+// Since this test runs check-libcxx-version, it requires execution.
+// REQUIRES: executable_test
+
 // CHECK: enum std {
 // CHECK: enum __1 {