diff --git a/osal/osal.h b/osal/osal.h
index 6ff9eab..ed07c51 100644
--- a/osal/osal.h
+++ b/osal/osal.h
@@ -15,9 +15,13 @@ extern "C"
 #include <stdint.h>
 
 /* General types */
-typedef uint8_t             boolean;
+#ifndef TRUE
 #define TRUE                1
+#endif
+#ifndef FALSE
 #define FALSE               0
+#endif
+typedef uint8_t             boolean;
 typedef int8_t              int8;
 typedef int16_t             int16;
 typedef int32_t             int32;