diff --git a/src/lib/libc/stdio/vfprintf.c b/src/lib/libc/stdio/vfprintf.c
index fbcd0c6..5be6f21 100755
--- a/src/lib/libc/stdio/vfprintf.c
+++ b/src/lib/libc/stdio/vfprintf.c
@@ -22,6 +22,7 @@
 **************************************************************************************/
 
 #include <stdio.h>
+#include <string.h>
 
 int vfprintf(FILE *fd,const char *fmt,vaList args) {
   int retVal = 0;
@@ -33,4 +34,4 @@
     : "i" (0x80),"a" (0),"b" (data),"c" (sizeof(data)),"d" (fd->fd)
     );
   return(retVal);
-  }
\ No newline at end of file
+  }