diff --git a/sql/sql_string.cc b/sql/sql_string.cc
index e9927c8e85c..bdecabd782b 100644
--- a/sql/sql_string.cc
+++ b/sql/sql_string.cc
@@ -27,14 +27,6 @@
 #include <floatingpoint.h>
 #endif
 
-/*
-  The following extern declarations are ok as these are interface functions
-  required by the string function
-*/
-
-extern uchar* sql_alloc(unsigned size);
-extern void sql_element_free(void *ptr);
-
 #include "sql_string.h"
 
 /*****************************************************************************