diff --git a/test/LLVMC/C++/dash-x.cpp b/test/LLVMC/C++/dash-x.cpp
index 437d8bbbe3b..b32400e0b03 100644
--- a/test/LLVMC/C++/dash-x.cpp
+++ b/test/LLVMC/C++/dash-x.cpp
@@ -1,14 +1,9 @@
 // Test that we can compile .c files as C++ and vice versa
-// RUN: llvmc -x c++ %s -x c %p/../test_data/false.cpp -x lisp -x whatnot -x none %p/../test_data/false2.cpp -o %t
+// RUN: llvmc %s -x c++ %p/../test_data/false.c -x c %p/../test_data/false.cpp -x lisp -x whatnot -x none %p/../test_data/false2.cpp -o %t
 // RUN: %abs_tmp | grep hello
 
-#include <iostream>
-
-extern "C" void test();
-extern std::string test2();
+extern int test_main();
 
 int main() {
-    std::cout << "h";
-    test();
-    std::cout << test2() << '\n';
+  test_main();
 }
diff --git a/test/LLVMC/test_data/false.c b/test/LLVMC/test_data/false.c
index 98842fe311e..3e4e8a7e928 100644
--- a/test/LLVMC/test_data/false.c
+++ b/test/LLVMC/test_data/false.c
@@ -3,8 +3,8 @@
 extern "C" void test();
 extern std::string test2();
 
-int main() {
-    std::cout << "h";
-    test();
-    std::cout << test2() << '\n';
+int test_main() {
+  std::cout << "h";
+  test();
+  std::cout << test2() << '\n';
 }