diff --git a/tests/suites/main_test.function b/tests/suites/main_test.function
index 14209a5..afff5a4 100644
--- a/tests/suites/main_test.function
+++ b/tests/suites/main_test.function
@@ -261,7 +261,7 @@
     char buf[5000];
     char *params[50];
     void *pointer;
-    int stdout_fd = 0;
+    int stdout_fd = -1;
 
 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) && \
     !defined(TEST_SUITE_MEMORY_BUFFER_ALLOC)
@@ -499,6 +499,11 @@
     mbedtls_memory_buffer_alloc_free();
 #endif
 
+#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
+    if( stdout_fd != -1 )
+        close_output( stdout );
+#endif /* __unix__ || __APPLE__ __MACH__ */
+
     return( total_errors != 0 );
 }