diff --git a/camlibs/ricoh/g3.c b/camlibs/ricoh/g3.c
index 2570df5c4..32c6495ac 100644
--- a/camlibs/ricoh/g3.c
+++ b/camlibs/ricoh/g3.c
@@ -358,7 +358,8 @@ get_file_func (CameraFilesystem *fs, const char *folder, const char *filename,
 {
 	Camera *camera = data;
 	char *buf = NULL, *reply = NULL, *cmd =NULL, *msg = NULL;
-	unsigned int len, bytes, seek;
+	unsigned int len, bytes;
+	int seek;
 	int ret, channel;
 
 	ret = g3_cwd_command (camera->port, folder);
@@ -758,7 +759,7 @@ folder_list_func (CameraFilesystem *fs, const char *folder, CameraList *list,
 	free(cmd);cmd = NULL;
 	if (ret < GP_OK) goto out;
 	if (buf[0] == '1') { /* 1xx means another reply follows */
-		int n = 0;
+		unsigned int n = 0;
 
 		ret = g3_channel_read(camera->port, &channel, &buf, &len); /* data. */
 		if (ret < GP_OK) goto out;
@@ -805,7 +806,8 @@ file_list_func (CameraFilesystem *fs, const char *folder, CameraList *list,
 	free(cmd); cmd = NULL;
 	if (ret < GP_OK) goto out;
 	if (buf[0] == '1') { /* 1xx means another reply follows */
-		int n = 0, channel;
+		unsigned int n = 0;
+		int channel;
 		unsigned int len, rlen;
 		ret = g3_channel_read(camera->port, &channel, &buf, &len); /* data. */
 		if (ret < GP_OK) goto out;
diff --git a/camlibs/ricoh/library.c b/camlibs/ricoh/library.c
index 7ee831c60..c40ab42c9 100644
--- a/camlibs/ricoh/library.c
+++ b/camlibs/ricoh/library.c
@@ -565,7 +565,7 @@ camera_init (Camera *camera, GPContext *context)
 	}
 
 	/* Contact made. Do we need to change the speed? */
-	if (settings.serial.speed != speed) {
+	if ((unsigned int)settings.serial.speed != speed) {
 		for (i = 0; speeds[i].speed; i++)
 			if (speeds[i].speed == speed)
 				break;