diff --git a/src/main/java/de/dafuqs/spectrum/status_effects/EffectProlongingStatusEffect.java b/src/main/java/de/dafuqs/spectrum/status_effects/EffectProlongingStatusEffect.java
index 1fdba0bd3c..09d02a9407 100644
--- a/src/main/java/de/dafuqs/spectrum/status_effects/EffectProlongingStatusEffect.java
+++ b/src/main/java/de/dafuqs/spectrum/status_effects/EffectProlongingStatusEffect.java
@@ -17,7 +17,7 @@ public static boolean canBeExtended(Holder<MobEffect> statusEffect) {
 	}
 	
 	public static int getExtendedDuration(int originalDuration, int prolongingAmplifier) {
-		return (int) (originalDuration * (1 + ADDITIONAL_EFFECT_DURATION_MODIFIER_PER_LEVEL * prolongingAmplifier));
+		return (int) (originalDuration * (1 + ADDITIONAL_EFFECT_DURATION_MODIFIER_PER_LEVEL * (1 + prolongingAmplifier)));
 	}
 	
 }