diff --git a/features/frameworks/greentea-client/greentea-client/test_env.h b/features/frameworks/greentea-client/greentea-client/test_env.h
index 6aa2617c57..672874d29a 100644
--- a/features/frameworks/greentea-client/greentea-client/test_env.h
+++ b/features/frameworks/greentea-client/greentea-client/test_env.h
@@ -33,8 +33,12 @@
 /**
  *  Auxilary macros
  */
+#ifndef NL
 #define NL "\n"
+#endif
+#ifndef RCNL
 #define RCNL "\r\n"
+#endif
 
 /**
  *  Auxilary macros to keep mbed-drivers compatibility with utest before greentea-client
diff --git a/features/unsupported/tests/mbed/env/test_env.h b/features/unsupported/tests/mbed/env/test_env.h
index bfb2c44d2d..6a390dc551 100644
--- a/features/unsupported/tests/mbed/env/test_env.h
+++ b/features/unsupported/tests/mbed/env/test_env.h
@@ -4,8 +4,12 @@
 #include <stdio.h>
 #include "mbed.h"
 
+#ifndef NL
 #define NL "\n"
+#endif
+#ifndef RCNL
 #define RCNL "\r\n"
+#endif
 
 // Const strings used in test_end
 extern const char* TEST_ENV_START;