diff --git a/testing/ostest/ostest_main.c b/testing/ostest/ostest_main.c
index 2f7a05c15..2de06fca2 100644
--- a/testing/ostest/ostest_main.c
+++ b/testing/ostest/ostest_main.c
@@ -300,7 +300,7 @@ static int user_main(int argc, char *argv[])
   check_test_memory_usage();
 #endif
 
-#if CONFIG_TLS_NELEM > 0
+#if defined(CONFIG_TLS_NELEM) && CONFIG_TLS_NELEM > 0
   /* Test TLS */
 
   tls_test();
diff --git a/testing/ostest/tls.c b/testing/ostest/tls.c
index 56c5ecddb..7ae461cc6 100644
--- a/testing/ostest/tls.c
+++ b/testing/ostest/tls.c
@@ -33,7 +33,7 @@
 
 #include "ostest.h"
 
-#if CONFIG_TLS_NELEM > 0
+#if defined(CONFIG_TLS_NELEM) && CONFIG_TLS_NELEM > 0
 
 /****************************************************************************
  * Preprocessor Definitions