diff --git a/src/config.h b/src/config.h
index 37408c7a3..5ddb6436f 100644
--- a/src/config.h
+++ b/src/config.h
@@ -19,7 +19,11 @@
 /**
  * Limit of data (system heap, engine's data except engine's own heap)
  */
-#define CONFIG_MEM_DATA_LIMIT_MINUS_HEAP_SIZE 1024
+#ifdef LIBC_RAW
+# define CONFIG_MEM_DATA_LIMIT_MINUS_HEAP_SIZE 1024
+#else /* !LIBC_RAW */
+# define CONFIG_MEM_DATA_LIMIT_MINUS_HEAP_SIZE 16384
+#endif /* !LIBC_RAW */
 
 /**
  * Limit of stack size