diff --git a/inc/stdlib.h b/inc/stdlib.h
index c6d981d..9969bfa 100644
--- a/inc/stdlib.h
+++ b/inc/stdlib.h
@@ -16,12 +16,15 @@
 #endif
 
 
+#ifdef _RTLIBC_MALLOC_
+
 void malloc_init(void *heap, size_t size, size_t alignment);
 size_t msize(void *p);
 
 void* malloc(size_t size);
 void free(void *p);
 
+#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/src/stdlib.c b/src/stdlib.c
index 06ac18d..32f5e1f 100644
--- a/src/stdlib.c
+++ b/src/stdlib.c
@@ -282,6 +282,8 @@
 
 
 
+#ifdef _RTLIBC_MALLOC_
+
 static rtmalloc_context_t l_malloc_context;
 
 __attribute__((weak)) void rtlibc_malloc_failed_handler(void)
@@ -317,3 +319,5 @@
 	assert(p);
 	return rtmsize(&l_malloc_context, p);
 }
+
+#endif