diff --git a/res/res_config_odbc.c b/res/res_config_odbc.c
index 3f8490530c..82e9e681b8 100755
--- a/res/res_config_odbc.c
+++ b/res/res_config_odbc.c
@@ -44,7 +44,7 @@ static struct ast_config *config_odbc (char *file, struct ast_config *new_config
 	odbc_obj *obj;
 	SQLINTEGER err=0, commented=0, cat_metric=0, var_metric=0, last_cat_metric=0;
 	SQLBIGINT id;
-	char sql[255] = "", filename[128], category[128], var_name[128], var_val[128];
+	char sql[255]="", filename[128]="", category[128]="", var_name[128]="", var_val[512]="";
 	SQLSMALLINT rowcount=0;
 	SQLHSTMT stmt;
 	char last[80] = "";