diff --git a/camlibs/sonydscf55/sony.h b/camlibs/sonydscf55/sony.h
index f5ec0835d..1cd386f8c 100644
--- a/camlibs/sonydscf55/sony.h
+++ b/camlibs/sonydscf55/sony.h
@@ -35,7 +35,7 @@ typedef enum {
 
 typedef struct _tagPacket {
 	int valid;
-	int length;
+	unsigned int length;
 	unsigned char buffer[16384];
 	unsigned char checksum;
 } Packet;