diff --git a/components/drivers/include/drivers/misc.h b/components/drivers/include/drivers/misc.h
index 2b4b0a54435..8e3c8f22c28 100644
--- a/components/drivers/include/drivers/misc.h
+++ b/components/drivers/include/drivers/misc.h
@@ -14,11 +14,13 @@
 #include <rtdef.h>
 #include <cpuport.h>
 
+#ifndef RT_BITS_PER_LONG
 #ifdef ARCH_CPU_64BIT
 #define RT_BITS_PER_LONG 64
 #else
 #define RT_BITS_PER_LONG 32
 #endif
+#endif
 #define RT_BITS_PER_LONG_LONG 64
 
 #define RT_DIV_ROUND_UP(n, d)   (((n) + (d) - 1) / (d))