diff --git a/include/wx/dbtable.h b/include/wx/dbtable.h
index 78aaffe00d..d50b32e1c7 100644
--- a/include/wx/dbtable.h
+++ b/include/wx/dbtable.h
@@ -106,7 +106,7 @@ private:
     bool getRec(UWORD fetchType);
     bool execDelete(const char *pSqlStmt);
     bool execUpdate(const char *pSqlStmt);
-    bool query(int queryType, bool forUpdate, bool distinct, char *pSqlStmt = 0);
+    bool query(int queryType, bool forUpdate, bool distinct, const char *pSqlStmt = 0);
 
 public:
     // Pointer to the database object this table belongs to
@@ -160,7 +160,7 @@ public:
     bool    DeleteWhere(const char *pWhereClause);
     bool    DeleteMatching(void);
     virtual bool Query(bool forUpdate = FALSE, bool distinct = FALSE);
-    bool    QueryBySqlStmt(char *pSqlStmt);
+    bool    QueryBySqlStmt(const char *pSqlStmt);
     bool    QueryMatching(bool forUpdate = FALSE, bool distinct = FALSE);
     bool    QueryOnKeyFields(bool forUpdate = FALSE, bool distinct = FALSE);
     bool    GetNext(void)   { return(getRec(SQL_FETCH_NEXT));  }
diff --git a/src/common/dbtable.cpp b/src/common/dbtable.cpp
index 51c2b61a4e..1bd0469258 100644
--- a/src/common/dbtable.cpp
+++ b/src/common/dbtable.cpp
@@ -536,7 +536,7 @@ bool wxDbTable::execUpdate(const char *pSqlStmt)
 
 
 /********** wxDbTable::query() **********/
-bool wxDbTable::query(int queryType, bool forUpdate, bool distinct, char *pSqlStmt)
+bool wxDbTable::query(int queryType, bool forUpdate, bool distinct, const char *pSqlStmt)
 {
     char sqlStmt[DB_MAX_STATEMENT_LEN];
 
@@ -666,7 +666,7 @@ bool wxDbTable::Query(bool forUpdate, bool distinct)
 
 
 /********** wxDbTable::QueryBySqlStmt() **********/
-bool wxDbTable::QueryBySqlStmt(char *pSqlStmt)
+bool wxDbTable::QueryBySqlStmt(const char *pSqlStmt)
 {
     pDb->WriteSqlLog(pSqlStmt);