diff --git a/common/shareddb.cpp b/common/shareddb.cpp
index 163c8d6b9..f35967d50 100644
--- a/common/shareddb.cpp
+++ b/common/shareddb.cpp
@@ -1663,7 +1663,7 @@ void SharedDatabase::LoadSpells(void *data, int max_spells) {
 
 		sp[tempid].uninterruptable=atoi(row[146]) != 0;
 		sp[tempid].ResistDiff=atoi(row[147]);
-		sp[tempid].dot_stacking_exempt=atoi(row[148]);
+		sp[tempid].dot_stacking_exempt = atoi(row[148]) != 0;
 		sp[tempid].RecourseLink = atoi(row[150]);
 		sp[tempid].no_partial_resist = atoi(row[151]) != 0;
 
diff --git a/common/spdat.cpp b/common/spdat.cpp
index 02803b173..695b11dab 100644
--- a/common/spdat.cpp
+++ b/common/spdat.cpp
@@ -1100,6 +1100,17 @@ bool NoDetrimentalSpellAggro(uint16 spell_id)
 	return false;
 }
 
+bool IsStackableDot(uint16 spell_id)
+{
+	// rules according to client
+	if (!IsValidSpell(spell_id))
+		return false;
+	const auto &spell = spells[spell_id];
+	if (spell.dot_stacking_exempt || spell.goodEffect || !spell.buffdurationformula)
+		return false;
+	return IsEffectInSpell(spell_id, SE_CurrentHP) || IsEffectInSpell(spell_id, SE_GravityEffect);
+}
+
 uint32 GetNimbusEffect(uint16 spell_id)
 {
 	if (IsValidSpell(spell_id))
diff --git a/common/spdat.h b/common/spdat.h
index d083f0dbd..f6405d737 100644
--- a/common/spdat.h
+++ b/common/spdat.h
@@ -700,7 +700,7 @@ struct SPDat_Spell_Struct
 /* 145 */	//int16 spellanim; // Doesn't look like it's the same as #doanim, so not sure what this is
 /* 146 */	int8 uninterruptable;	// Looks like anything != 0 is uninterruptable. Values are mostly -1, 0, & 1 (Fetid Breath = 90?)
 /* 147 */	int16 ResistDiff;
-/* 148 */	int8 dot_stacking_exempt; // If 1 doesn't stack with self cast by others. If -1 (not implemented) doesn't stack with same effect (???)
+/* 148 */	bool dot_stacking_exempt;
 /* 149 */	//int deletable;
 /* 150 */	uint16 RecourseLink;
 /* 151 */	bool no_partial_resist;	// 151: -1, 0, or 1
@@ -882,6 +882,7 @@ uint32 GetPartialMagicRuneReduction(uint32 spell_id);
 uint32 GetPartialMeleeRuneAmount(uint32 spell_id);
 uint32 GetPartialMagicRuneAmount(uint32 spell_id);
 bool NoDetrimentalSpellAggro(uint16 spell_id);
+bool IsStackableDot(uint16 spell_id);
 
 int CalcPetHp(int levelb, int classb, int STA = 75);
 const char *GetRandPetName();
diff --git a/zone/spells.cpp b/zone/spells.cpp
index e7a090e57..4dcda4889 100644
--- a/zone/spells.cpp
+++ b/zone/spells.cpp
@@ -2763,7 +2763,7 @@ int Mob::CheckStackConflict(uint16 spellid1, int caster_level1, uint16 spellid2,
 
 	// Same Spells and dot exemption is set to 1 or spell is Manaburn
 	if (spellid1 == spellid2) {
-		if (sp1.dot_stacking_exempt == 1 && caster1 != caster2) { // same caster can refresh
+		if (IsStackableDot(spellid1) && caster1 != caster2) { // same caster can refresh
 			Log.Out(Logs::Detail, Logs::Spells, "Blocking spell due to dot stacking exemption.");
 			return -1;
 		} else if (spellid1 == 2751) {