diff --git a/config.go b/config.go
index 65d4f7b..76651f1 100644
--- a/config.go
+++ b/config.go
@@ -105,9 +105,9 @@ func createConfig(key int, uri *url.URL, config *Config, valueSystem *boltValueS
 	C.BoltConfig_set_routing_context(cConfig, cRoutingContext)
 	C.BoltConfig_set_address_resolver(cConfig, cResolver)
 	C.BoltConfig_set_log(cConfig, cLogger)
-	C.BoltConfig_set_max_pool_size(cConfig, C.int(config.MaxPoolSize))
-	C.BoltConfig_set_max_connection_life_time(cConfig, C.int(config.MaxConnLifetime/time.Millisecond))
-	C.BoltConfig_set_max_connection_acquisition_time(cConfig, C.int(config.ConnAcquisitionTimeout/time.Millisecond))
+	C.BoltConfig_set_max_pool_size(cConfig, C.int32_t(config.MaxPoolSize))
+	C.BoltConfig_set_max_connection_life_time(cConfig, C.int32_t(config.MaxConnLifetime/time.Millisecond))
+	C.BoltConfig_set_max_connection_acquisition_time(cConfig, C.int32_t(config.ConnAcquisitionTimeout/time.Millisecond))
 	C.BoltConfig_set_socket_options(cConfig, cSocketOpts)
 	return cConfig, nil
 }
@@ -135,7 +135,7 @@ func transport(config *Config) C.BoltTransport {
 func createSocketOptions(config *Config) *C.struct_BoltSocketOptions {
 	var cSocketOpts = C.BoltSocketOptions_create()
 
-	C.BoltSocketOptions_set_connect_timeout(cSocketOpts, C.int(config.SockConnectTimeout/time.Millisecond))
+	C.BoltSocketOptions_set_connect_timeout(cSocketOpts, C.int32_t(config.SockConnectTimeout/time.Millisecond))
 	C.BoltSocketOptions_set_keep_alive(cSocketOpts, 1)
 	if !config.SockKeepalive {
 		C.BoltSocketOptions_set_keep_alive(cSocketOpts, 0)
diff --git a/value.go b/value.go
index 17317c8..833c0ed 100644
--- a/value.go
+++ b/value.go
@@ -94,7 +94,7 @@ func (valueSystem *boltValueSystem) valueAsFloat(value *C.struct_BoltValue) floa
 
 func (valueSystem *boltValueSystem) valueAsString(value *C.struct_BoltValue) string {
 	val := C.BoltString_get(value)
-	return C.GoStringN(val, C.BoltValue_size(value))
+	return C.GoStringN(val, C.int(C.BoltValue_size(value)))
 }
 
 func (valueSystem *boltValueSystem) valueAsDictionary(value *C.struct_BoltValue) (map[string]interface{}, error) {
@@ -145,7 +145,7 @@ func (valueSystem *boltValueSystem) structAsList(value *C.struct_BoltValue) ([]i
 
 func (valueSystem *boltValueSystem) valueAsBytes(value *C.struct_BoltValue) []byte {
 	val := C.BoltBytes_get_all(value)
-	return C.GoBytes(unsafe.Pointer(val), C.BoltValue_size(value))
+	return C.GoBytes(unsafe.Pointer(val), C.int(C.BoltValue_size(value)))
 }
 
 func (valueSystem *boltValueSystem) valueToConnector(value interface{}) (*C.struct_BoltValue, error) {