diff --git a/include/mpu_wrappers.h b/include/mpu_wrappers.h
index a5c081f..6550c1e 100644
--- a/include/mpu_wrappers.h
+++ b/include/mpu_wrappers.h
@@ -29,7 +29,7 @@
 
 /* This file redefines API functions to be called through a wrapper macro, but
  * only for ports that are using the MPU. */
-#ifdef portUSING_MPU_WRAPPERS
+#if ( portUSING_MPU_WRAPPERS == 1 )
 
 /* MPU_WRAPPERS_INCLUDED_FROM_API_FILE will be defined when this file is
  * included from queue.c or task.c to prevent it from having an effect within