diff --git a/inc/stdlib.h b/inc/stdlib.h
index 9969bfa..5549f73 100644
--- a/inc/stdlib.h
+++ b/inc/stdlib.h
@@ -26,6 +26,18 @@
 
 #endif
 
+#ifdef _RTLIBC_MALLOC_FREERTOS_
+
+#define malloc_init()
+#define msize() (0)
+
+#define malloc(size) pvPortMalloc(size)
+#define free(ptr) vPortFree(ptr)
+
+#endif
+
+
+
 uint64_t strtoul(const char *str, char **endptr, int32_t base);
 int64_t strtol(const char *str, char **endptr, int32_t base);
 
diff --git a/readme.txt b/readme.txt
index a6168ea..16232a6 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,4 +1,6 @@
 To enable asserts define _RTLIBC_ASSERT_
+To enable RTLIBC malloc() define _RTLIBC_MALLOC_
+To enable FreeRTOS malloc() define _RTLIBC_MALLOC_FREERTOS_
 
 
 The following functions are weak and can be defined by the user: