diff --git a/components/external/jpeg/jerror.c b/components/external/jpeg/jerror.c
index b1cbe5d67..a763db1c6 100644
--- a/components/external/jpeg/jerror.c
+++ b/components/external/jpeg/jerror.c
@@ -32,6 +32,9 @@
 #define EXIT_FAILURE  1
 #endif
 
+/* sprintf wrapper for RT-Thread */
+#include <rtthread.h>
+#define sprintf	rt_sprintf
 
 /*
  * Create the message string table.
diff --git a/components/external/jpeg/jmemnobs.c b/components/external/jpeg/jmemnobs.c
index eb8c33772..37d3b4509 100644
--- a/components/external/jpeg/jmemnobs.c
+++ b/components/external/jpeg/jmemnobs.c
@@ -25,6 +25,10 @@ extern void * malloc JPP((size_t size));
 extern void free JPP((void *ptr));
 #endif
 
+/* memory wrapper for RT-Thread */
+#include <rtthread.h>
+#define malloc rt_malloc
+#define free rt_free
 
 /*
  * Memory allocation and freeing are controlled by the regular library