diff --git a/include/stdio.h b/include/stdio.h
index 3241e2d..7b999a5 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -46,6 +46,23 @@
 }
 #endif
 
+/**
+ * Format a string and place it in a buffer
+ *
+ * @buf: The buffer to place the result into
+ * @size: The size of the buffer, including the trailing null space
+ * @fmt: The format string to use
+ * @...: Arguments for the format string
+ * Return: the number of characters which would be
+ * generated for the given input, excluding the trailing null,
+ * as per ISO C99.  If the return is greater than or equal to
+ * @size, the resulting string is truncated.
+ *
+ * See the vsprintf() documentation for format string extensions over C99.
+ */
+int snprintf(char *buf, size_t size, const char *fmt, ...)
+	     __attribute__ ((format (__printf__, 3, 4)));
+
 /*
  * FILE based functions (can only be used AFTER relocation!)
  */