diff --git a/include/game/packet_parsers.hpp b/include/game/packet_parsers.hpp
index 8413002c..03fc502e 100644
--- a/include/game/packet_parsers.hpp
+++ b/include/game/packet_parsers.hpp
@@ -332,6 +332,8 @@ public:
     bool parseGossipMessage(network::Packet& packet, GossipMessageData& data) override;
     // TBC 2.4.3 SMSG_CAST_RESULT: spellId(u32) + result(u8) — WotLK added castCount(u8) prefix
     bool parseCastResult(network::Packet& packet, uint32_t& spellId, uint8_t& result) override;
+    // TBC 2.4.3 SMSG_CAST_FAILED: spellId(u32) + result(u8) — WotLK added castCount(u8) prefix
+    bool parseCastFailed(network::Packet& packet, CastFailedData& data) override;
     // TBC 2.4.3 SMSG_SPELL_START: full uint64 GUIDs (WotLK uses packed GUIDs)
     bool parseSpellStart(network::Packet& packet, SpellStartData& data) override;
     // TBC 2.4.3 SMSG_SPELL_GO: full uint64 GUIDs, no timestamp field (WotLK added one)
diff --git a/src/game/packet_parsers_tbc.cpp b/src/game/packet_parsers_tbc.cpp
index db9d007b..5cef0290 100644
--- a/src/game/packet_parsers_tbc.cpp
+++ b/src/game/packet_parsers_tbc.cpp
@@ -1080,6 +1080,24 @@ bool TbcPacketParsers::parseCastResult(network::Packet& packet, uint32_t& spellI
     return true;
 }
 
+// ============================================================================
+// TbcPacketParsers::parseCastFailed — TBC 2.4.3 SMSG_CAST_FAILED
+//
+// TBC format: spellId(u32) + result(u8)
+// WotLK added castCount(u8) before spellId; reading it on TBC would shift
+// the spellId by one byte and corrupt all subsequent fields.
+// Classic has the same layout, but the result enum starts differently (offset +1);
+// TBC uses the same result values as WotLK so no offset is needed.
+// ============================================================================
+bool TbcPacketParsers::parseCastFailed(network::Packet& packet, CastFailedData& data) {
+    if (packet.getSize() - packet.getReadPos() < 5) return false;
+    data.castCount = 0;                      // not present in TBC
+    data.spellId   = packet.readUInt32();
+    data.result    = packet.readUInt8();     // same enum as WotLK
+    LOG_DEBUG("[TBC] Cast failed: spell=", data.spellId, " result=", (int)data.result);
+    return true;
+}
+
 // ============================================================================
 // TbcPacketParsers::parseAttackerStateUpdate — TBC 2.4.3 SMSG_ATTACKERSTATEUPDATE
 //