diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/core/collect/IntRange2Set.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/core/collect/IntRange2Set.kt
index fccb08844..7e1588613 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/core/collect/IntRange2Set.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/core/collect/IntRange2Set.kt
@@ -87,7 +87,7 @@ class IntRange2Set private constructor(private val first: Int, private val last:
 	}
 
 	override fun isEmpty(): Boolean {
-		return last > first
+		return last < first
 	}
 
 	override fun toArray(a: IntArray?): IntArray {
@@ -158,7 +158,7 @@ class IntRange2Set private constructor(private val first: Int, private val last:
 	}
 
 	override val size: Int
-		get() = if (last > first) 0 else last - first + 1
+		get() = if (last < first) 0 else last - first + 1
 
 	override fun toString(): String {
 		if (isEmpty())