diff --git a/cache/src/main/kotlin/org/openrs2/cache/RuneLiteStore.kt b/cache/src/main/kotlin/org/openrs2/cache/RuneLiteStore.kt
index 137ae1d5..8ce5c8a3 100644
--- a/cache/src/main/kotlin/org/openrs2/cache/RuneLiteStore.kt
+++ b/cache/src/main/kotlin/org/openrs2/cache/RuneLiteStore.kt
@@ -100,7 +100,24 @@ public class RuneLiteStore @Inject constructor(
 
                         "contents" -> {
                             Unpooled.wrappedBuffer(Base64.getDecoder().decode(value)).use { buf ->
-                                output.write(archive, group!!.id, buf)
+                                // Some groups have version trailers and some don't. Fix that up here.
+                                if (group!!.checksum != buf.crc32()) {
+                                    if (group!!.version != VersionTrailer.strip(buf)) {
+                                        throw StoreCorruptException("Group version does not match contents")
+                                    }
+
+                                    if (group!!.checksum != buf.crc32()) {
+                                        throw StoreCorruptException("Group CRC does not match contents")
+                                    }
+                                }
+
+                                alloc.buffer(2, 2).use { versionBuf ->
+                                    versionBuf.writeShort(group!!.version)
+
+                                    Unpooled.wrappedBuffer(buf.retain(), versionBuf.retain()).use { combinedBuf ->
+                                        output.write(archive, group!!.id, combinedBuf)
+                                    }
+                                }
                             }
                         }