diff --git a/os_functions.h b/os_functions.h
index 8e1d6c1..ab9d1da 100644
--- a/os_functions.h
+++ b/os_functions.h
@@ -37,8 +37,9 @@ extern "C" {
 #define MILLISECS_TO_TICKS(msec)        (SECS_TO_TICKS(msec) / 1000)
 #define MICROSECS_TO_TICKS(usec)        (SECS_TO_TICKS(usec) / 1000000)
 
-#define usleep(usecs)                   OSSleepTicks(MICROSECS_TO_TICKS(usecs))
-#define sleep(secs)                     OSSleepTicks(SECS_TO_TICKS(secs))
+//To avoid conflicts with the unistd.h
+#define os_usleep(usecs)                OSSleepTicks(MICROSECS_TO_TICKS(usecs))
+#define os_sleep(secs)                  OSSleepTicks(SECS_TO_TICKS(secs))
 
 #define FLUSH_DATA_BLOCK(addr)          asm volatile("dcbf 0, %0; sync" : : "r"(((addr) & ~31)))
 #define INVAL_DATA_BLOCK(addr)          asm volatile("dcbi 0, %0; sync" : : "r"(((addr) & ~31)))