diff --git a/src/dbi_impl.jl b/src/dbi_impl.jl
index a1e2fae..3a95734 100644
--- a/src/dbi_impl.jl
+++ b/src/dbi_impl.jl
@@ -130,7 +130,7 @@ function copy_from(db::PostgresDatabaseHandle, table::AbstractString,
     return checkerrclear(PQgetResult(db.ptr))
 end
 
-hashsql(sql::AbstractString) = unsafe_string(string("__", hash(sql), "__"))
+hashsql(sql::AbstractString) = String(string("__", hash(sql), "__"))
 
 function getparamtypes(result::Ptr{PGresult})
     nparams = PQnparams(result)
diff --git a/src/libpq_common.jl b/src/libpq_common.jl
index 02fe849..407a93d 100644
--- a/src/libpq_common.jl
+++ b/src/libpq_common.jl
@@ -50,14 +50,14 @@ const PGF_BINARY = 1
 # Skipping MacroDefinition: PQsetdb(M_PGHOST,M_PGPORT,M_PGOPT,M_PGTTY,M_DBNAME)PQsetdbLogin(M_PGHOST,M_PGPORT,M_PGOPT,M_PGTTY,M_DBNAME,NULL,NULL)
 # Skipping MacroDefinition: PQfreeNotify(ptr)PQfreemem(ptr)
 const PQnoPasswordSupplied = "fe_sendauth: no password supplied\n"
-typealias _IO_lock_t Union{}
-typealias va_list Cint
+const _IO_lock_t = Union{}
+const va_list = Cint
 # typealias off_t __off_t
 # typealias ssize_t __ssize_t
 # typealias fpos_t _G_fpos_t
-typealias Oid UInt32
+const Oid = UInt32
 # begin enum ConnStatusType
-typealias ConnStatusType UInt32
+const ConnStatusType = UInt32
 const CONNECTION_OK = 0
 const CONNECTION_BAD = 1
 const CONNECTION_STARTED = 2
@@ -69,7 +69,7 @@ const CONNECTION_SSL_STARTUP = 7
 const CONNECTION_NEEDED = 8
 # end enum ConnStatusType
 # begin enum PostgresPollingStatusType
-typealias PostgresPollingStatusType UInt32
+const PostgresPollingStatusType = UInt32
 const PGRES_POLLING_FAILED = 0
 const PGRES_POLLING_READING = 1
 const PGRES_POLLING_WRITING = 2
@@ -77,7 +77,7 @@ const PGRES_POLLING_OK = 3
 const PGRES_POLLING_ACTIVE = 4
 # end enum PostgresPollingStatusType
 # begin enum ExecStatusType
-typealias ExecStatusType UInt32
+const ExecStatusType = UInt32
 const PGRES_EMPTY_QUERY = 0
 const PGRES_COMMAND_OK = 1
 const PGRES_TUPLES_OK = 2
@@ -90,7 +90,7 @@ const PGRES_COPY_BOTH = 8
 const PGRES_SINGLE_TUPLE = 9
 # end enum ExecStatusType
 # begin enum PGTransactionStatusType
-typealias PGTransactionStatusType UInt32
+const PGTransactionStatusType = UInt32
 const PQTRANS_IDLE = 0
 const PQTRANS_ACTIVE = 1
 const PQTRANS_INTRANS = 2
@@ -98,21 +98,30 @@ const PQTRANS_INERROR = 3
 const PQTRANS_UNKNOWN = 4
 # end enum PGTransactionStatusType
 # begin enum PGVerbosity
-typealias PGVerbosity UInt32
+const PGVerbosity = UInt32
 const PQERRORS_TERSE = 0
 const PQERRORS_DEFAULT = 1
 const PQERRORS_VERBOSE = 2
 # end enum PGVerbosity
 # begin enum PGPing
-typealias PGPing UInt32
+const PGPing = UInt32
 const PQPING_OK = 0
 const PQPING_REJECT = 1
 const PQPING_NO_RESPONSE = 2
 const PQPING_NO_ATTEMPT = 3
 # end enum PGPing
-typealias PQnoticeReceiver Ptr{Void}
-typealias PQnoticeProcessor Ptr{Void}
-typealias pqbool UInt8
-typealias pgthreadlock_t Ptr{Void}
-typealias PGconn Void
-typealias PGresult Void
+const PQnoticeReceiver = Ptr{Void}
+const PQnoticeProcessor = Ptr{Void}
+const pqbool = UInt8
+const pgthreadlock_t = Ptr{Void}
+const PGconn = Void
+const PGresult = Void
+
+const _IO_FILE = Void
+const FILE = Void
+const PQconninfoOption = Void
+const PGcancel = Void
+const PGnotify = Void
+const PQArgBlock = Void
+const PGresAttDesc = Void
+const PQprintOpt = Void
diff --git a/src/libpq_interface.jl b/src/libpq_interface.jl
index 89a7840..1c816b5 100644
--- a/src/libpq_interface.jl
+++ b/src/libpq_interface.jl
@@ -94,8 +94,6 @@ module libpq_interface
     @c Cint _IO_vfprintf (Ptr{_IO_FILE}, Ptr{UInt8}, Cint) libpq
     # @c __ssize_t _IO_padn (Ptr{_IO_FILE}, Cint, __ssize_t) libpq
     @c Cint _IO_sgetn (Ptr{_IO_FILE}, Ptr{Void}, Cint) libpq
-    @c __off64_t _IO_seekoff (Ptr{_IO_FILE}, __off64_t, Cint, Cint) libpq
-    @c __off64_t _IO_seekpos (Ptr{_IO_FILE}, __off64_t, Cint) libpq
     @c Void _IO_free_backup_area (Ptr{_IO_FILE},) libpq
     @c Cint remove (Ptr{UInt8},) libpq
     @c Cint rename (Ptr{UInt8}, Ptr{UInt8}) libpq
diff --git a/src/types.jl b/src/types.jl
index 2970f6b..c8d5f3a 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -2,10 +2,10 @@ import DataArrays: NAtype
 import JSON
 import Compat: Libc, unsafe_convert, parse, @compat, String, unsafe_string
 
-abstract AbstractPostgresType
+@compat abstract type AbstractPostgresType end
 type PostgresType{Name} <: AbstractPostgresType end
 
-abstract AbstractOID
+@compat abstract type AbstractOID end
 type OID{N} <: AbstractOID end
 
 oid{T<:AbstractPostgresType}(t::Type{T}) = convert(OID, t)
@@ -55,7 +55,7 @@ newpgtype(:_varchar, 1015, (Vector{String},))
 newpgtype(:_text, 1009, (Vector{String},))
 
 
-typealias PGStringTypes Union{Type{PostgresType{:bpchar}},
+const PGStringTypes = Union{Type{PostgresType{:bpchar}},
                               Type{PostgresType{:varchar}},
                               Type{PostgresType{:text}},
                               Type{PostgresType{:date}}}
@@ -153,24 +153,24 @@ function pgdata(::Type{PostgresType{:numeric}}, ptr::Ptr{UInt8}, data::Number)
 end
 
 function pgdata(::PGStringTypes, ptr::Ptr{UInt8}, data::AbstractString)
-    ptr = storestring!(ptr, data)
+    ptr = storestring!(ptr, String(data))
 end
 
 function pgdata(::PostgresType{:date}, ptr::Ptr{UInt8}, data::AbstractString)
-    ptr = storestring!(ptr, data)
+    ptr = storestring!(ptr, String(data))
     ptr = Dates.DateFormat(ptr)
 end
 
 function pgdata(::PostgresType{:timestamp}, ptr::Ptr{UInt8}, data::AbstractString)
-    ptr = storestring!(ptr, data)
+    ptr = storestring!(ptr, String(data))
 end
 
 function pgdata(::PostgresType{:timestamptz}, ptr::Ptr{UInt8}, data::AbstractString)
-    ptr = storestring!(ptr, data)
+    ptr = storestring!(ptr, String(data))
 end
 
 function pgdata(::Type{PostgresType{:bytea}}, ptr::Ptr{UInt8}, data::Vector{UInt8})
-    ptr = storestring!(ptr, string("\\x", bytes2hex(data)))
+    ptr = storestring!(ptr, String(string("\\x", bytes2hex(data))))
 end
 
 function pgdata(::Type{PostgresType{:unknown}}, ptr::Ptr{UInt8}, data)
@@ -178,11 +178,11 @@ function pgdata(::Type{PostgresType{:unknown}}, ptr::Ptr{UInt8}, data)
 end
 
 function pgdata{T<:AbstractString}(::Type{PostgresType{:json}}, ptr::Ptr{UInt8}, data::Dict{T,Any})
-    ptr = storestring!(ptr, JSON.json(data))
+    ptr = storestring!(ptr, String(JSON.json(data)))
 end
 
 function pgdata{T<:AbstractString}(::Type{PostgresType{:jsonb}}, ptr::Ptr{UInt8}, data::Dict{T,Any})
-    ptr = storestring!(ptr, JSON.json(data))
+    ptr = storestring!(ptr, String(JSON.json(data)))
 end
 
 function pgdata(::Type{PostgresType{:_bool}}, ptr::Ptr{UInt8}, data::Vector{Bool})
@@ -218,7 +218,7 @@ function pgdata(::Type{PostgresType{:_text}}, ptr::Ptr{UInt8}, data::Vector{Stri
 end
 
 # dbi
-abstract Postgres <: DBI.DatabaseSystem
+@compat abstract type Postgres<:DBI.DatabaseSystem end
 
 type PostgresDatabaseHandle <: DBI.DatabaseHandle
     ptr::Ptr{PGconn}