diff --git a/common/version.h b/common/version.h
index 9bdfa1984..56b4f3b0c 100644
--- a/common/version.h
+++ b/common/version.h
@@ -34,7 +34,7 @@
  * Manifest: https://github.com/EQEmu/Server/blob/master/utils/sql/db_update_manifest.txt
  */
 
-#define CURRENT_BINARY_DATABASE_VERSION 9160
+#define CURRENT_BINARY_DATABASE_VERSION 9161
 
 #ifdef BOTS
 	#define CURRENT_BINARY_BOTS_DATABASE_VERSION 9027
diff --git a/utils/sql/db_update_manifest.txt b/utils/sql/db_update_manifest.txt
index d02536a2b..df613531c 100644
--- a/utils/sql/db_update_manifest.txt
+++ b/utils/sql/db_update_manifest.txt
@@ -414,6 +414,7 @@
 9158|2020_12_09_underworld.sql|SHOW COLUMNS from `zone` LIKE 'underworld_teleport_index'|empty|
 9159|2020_12_22_expedition_system.sql|SELECT * FROM db_version WHERE version >= 9159|empty|
 9160|2021_02_14_npc_exp_mod.sql|SHOW COLUMNS from `npc_types` LIKE 'exp_mod'|empty|
+9161|2021_02_15_npc_spell_entries_unsigned.sql|SELECT * FROM db_version WHERE version >= 9161|empty|
 
 # Upgrade conditions:
 # 	This won't be needed after this system is implemented, but it is used database that are not
diff --git a/utils/sql/git/required/2021_02_15_npc_spell_entries_unsigned.sql b/utils/sql/git/required/2021_02_15_npc_spell_entries_unsigned.sql
new file mode 100644
index 000000000..1022c8708
--- /dev/null
+++ b/utils/sql/git/required/2021_02_15_npc_spell_entries_unsigned.sql
@@ -0,0 +1 @@
+ALTER TABLE `npc_spell_entries` MODIFY `spellid` UNSIGNED SMALLINT(5) NOT NULL DEFAULT 0;
\ No newline at end of file
diff --git a/zone/mob_ai.cpp b/zone/mob_ai.cpp
index 6f2fbba61..306c6dd64 100644
--- a/zone/mob_ai.cpp
+++ b/zone/mob_ai.cpp
@@ -2489,7 +2489,7 @@ create table npc_spells_entries (
 	);
 */
 
-bool IsSpellInList(DBnpcspells_Struct* spell_list, int16 iSpellID);
+bool IsSpellInList(DBnpcspells_Struct* spell_list, uint16 iSpellID);
 bool IsSpellEffectInList(DBnpcspellseffects_Struct* spelleffect_list, uint16 iSpellEffectID, int32 base, int32 limit, int32 max);
 
 bool NPC::AI_AddNPCSpells(uint32 iDBSpellsID) {
@@ -2761,14 +2761,14 @@ bool IsSpellEffectInList(DBnpcspellseffects_Struct* spelleffect_list, uint16 iSp
 	return false;
 }
 
-bool IsSpellInList(DBnpcspells_Struct* spell_list, int16 iSpellID) {
+bool IsSpellInList(DBnpcspells_Struct* spell_list, uint16 iSpellID) {
 	auto it = std::find_if(spell_list->entries.begin(), spell_list->entries.end(),
 			       [iSpellID](const DBnpcspells_entries_Struct &a) { return a.spellid == iSpellID; });
 	return it != spell_list->entries.end();
 }
 
 // adds a spell to the list, taking into account priority and resorting list as needed.
-void NPC::AddSpellToNPCList(int16 iPriority, int16 iSpellID, uint32 iType,
+void NPC::AddSpellToNPCList(int16 iPriority, uint16 iSpellID, uint32 iType,
 							int16 iManaCost, int32 iRecastDelay, int16 iResistAdjust, int8 min_hp, int8 max_hp)
 {
 
@@ -2795,7 +2795,7 @@ void NPC::AddSpellToNPCList(int16 iPriority, int16 iSpellID, uint32 iType,
 		AIautocastspell_timer->Start(RandomTimer(0, 300), false);
 }
 
-void NPC::RemoveSpellFromNPCList(int16 spell_id)
+void NPC::RemoveSpellFromNPCList(uint16 spell_id)
 {
 	auto iter = AIspells.begin();
 	while(iter != AIspells.end())
diff --git a/zone/npc.h b/zone/npc.h
index 92e6b6775..de64e6b59 100644
--- a/zone/npc.h
+++ b/zone/npc.h
@@ -437,9 +437,9 @@ public:
 	void NPCSlotTexture(uint8 slot, uint16 texture);	// Sets new material values for slots
 
 	uint32 GetAdventureTemplate() const { return adventure_template_id; }
-	void AddSpellToNPCList(int16 iPriority, int16 iSpellID, uint32 iType, int16 iManaCost, int32 iRecastDelay, int16 iResistAdjust, int8 min_hp, int8 max_hp);
+	void AddSpellToNPCList(int16 iPriority, uint16 iSpellID, uint32 iType, int16 iManaCost, int32 iRecastDelay, int16 iResistAdjust, int8 min_hp, int8 max_hp);
 	void AddSpellEffectToNPCList(uint16 iSpellEffectID, int32 base, int32 limit, int32 max);
-	void RemoveSpellFromNPCList(int16 spell_id);
+	void RemoveSpellFromNPCList(uint16 spell_id);
 	Timer *GetRefaceTimer() const { return reface_timer; }
 	const uint32 GetAltCurrencyType() const { return NPCTypedata->alt_currency_type; }
 
diff --git a/zone/zonedb.h b/zone/zonedb.h
index 569819100..c32a92f77 100644
--- a/zone/zonedb.h
+++ b/zone/zonedb.h
@@ -52,7 +52,7 @@ struct wplist {
 
 #pragma pack(1)
 struct DBnpcspells_entries_Struct {
-	int16	spellid;
+	uint16	spellid;
 	uint8	minlevel;
 	uint8	maxlevel;
 	uint32	type;