diff --git a/src/include/string.h b/src/include/string.h
index 5b2486a..f2777a9 100644
--- a/src/include/string.h
+++ b/src/include/string.h
@@ -15,7 +15,7 @@
 void *memset(void *s, int c, size_t n);
 int memcmp(const void *s1, const void *s2, size_t n);
 void *memchr(const void *s, int c, size_t n);
-#if !defined(__PRE_RAM__)
+#if !defined(__ROMCC__)
 int snprintf(char * buf, size_t size, const char *fmt, ...);
 #endif