diff --git a/sources/backend.c b/sources/backend.c
index 01ff718b..a78fb817 100644
--- a/sources/backend.c
+++ b/sources/backend.c
@@ -361,7 +361,8 @@ int od_backend_connect_cancel(od_server_t *server,
 	return 0;
 }
 
-int od_backend_ready_wait(od_server_t *server, char *context, int count, int time_ms)
+int od_backend_ready_wait(od_server_t *server, char *context, int count,
+                          uint32_t time_ms)
 {
 	od_instance_t *instance = server->system->instance;
 
diff --git a/sources/backend.h b/sources/backend.h
index f5862f86..af402c05 100644
--- a/sources/backend.h
+++ b/sources/backend.h
@@ -13,7 +13,7 @@ void od_backend_close(od_server_t*);
 int  od_backend_terminate(od_server_t*);
 void od_backend_error(od_server_t*, char*, char*, int);
 int  od_backend_ready(od_server_t*, char*, char*, int);
-int  od_backend_ready_wait(od_server_t*, char*, int, int);
+int  od_backend_ready_wait(od_server_t*, char*, int, uint32_t);
 int  od_backend_query(od_server_t*, char*, char*, int);
 
 #endif /* OD_BACKEND_H */
diff --git a/sources/io.c b/sources/io.c
index 9630a2f3..983dba4c 100644
--- a/sources/io.c
+++ b/sources/io.c
@@ -25,7 +25,7 @@
 #include "sources/logger.h"
 #include "sources/io.h"
 
-int od_read(machine_io_t *io, shapito_stream_t *stream, int time_ms)
+int od_read(machine_io_t *io, shapito_stream_t *stream, uint32_t time_ms)
 {
 	uint32_t request_start = shapito_stream_used(stream);
 	uint32_t request_size = 0;
diff --git a/sources/io.h b/sources/io.h
index 204d60fe..d2932e1b 100644
--- a/sources/io.h
+++ b/sources/io.h
@@ -7,7 +7,7 @@
  * Advanced PostgreSQL connection pooler.
 */
 
-int od_read(machine_io_t*, shapito_stream_t*, int);
+int od_read(machine_io_t*, shapito_stream_t*, uint32_t);
 int od_write(machine_io_t*, shapito_stream_t*);
 int od_getaddrname(struct addrinfo*, char*, int, int, int);
 int od_getpeername(machine_io_t*, char*, int, int, int);