diff --git a/c/src/tests/tmtests/tm27/task1.c b/c/src/tests/tmtests/tm27/task1.c
index 94258b0975..017fb01048 100644
--- a/c/src/tests/tmtests/tm27/task1.c
+++ b/c/src/tests/tmtests/tm27/task1.c
@@ -19,6 +19,7 @@
 #define TEST_INIT
 #include "system.h"
 
+#define RTEMS_TM27
 #include <bsp.h>
 
 rtems_task Task_1(
diff --git a/testsuites/tmtests/tm27/task1.c b/testsuites/tmtests/tm27/task1.c
index 94258b0975..017fb01048 100644
--- a/testsuites/tmtests/tm27/task1.c
+++ b/testsuites/tmtests/tm27/task1.c
@@ -19,6 +19,7 @@
 #define TEST_INIT
 #include "system.h"
 
+#define RTEMS_TM27
 #include <bsp.h>
 
 rtems_task Task_1(