diff --git a/common/patches/rof2.cpp b/common/patches/rof2.cpp
index 6947ded15..d0189e56a 100644
--- a/common/patches/rof2.cpp
+++ b/common/patches/rof2.cpp
@@ -5053,7 +5053,7 @@ namespace RoF2
 
 		//sprintf(hdr.unknown000, "06e0002Y1W00");
 
-		snprintf(hdr.unknown000, sizeof(hdr.unknown000), "%012d", item->ID);
+		snprintf(hdr.unknown000, sizeof(hdr.unknown000), "%016d", item->ID);
 
 		hdr.stacksize = stackable ? charges : 1;
 		hdr.unknown004 = 0;
diff --git a/common/patches/rof2_structs.h b/common/patches/rof2_structs.h
index 9ef524f55..95f5c31e6 100644
--- a/common/patches/rof2_structs.h
+++ b/common/patches/rof2_structs.h
@@ -4353,7 +4353,7 @@ struct RoF2SlotStruct
 
 struct ItemSerializationHeader
 {
-/*000*/	char unknown000[13];	// New for HoT. Looks like a string.
+/*000*/	char unknown000[17];	// New for HoT. Looks like a string.
 /*017*/	uint32 stacksize;
 /*021*/	uint32 unknown004;
 /*025*/	uint8  slot_type;	// 0 = normal, 1 = bank, 2 = shared bank, 9 = merchant, 20 = ?