diff --git a/src/commonMain/kotlin/com/infendro/hash/blake2/Blake2b.kt b/src/commonMain/kotlin/com/infendro/hash/blake2/Blake2b.kt
index 95bc274..d9e27b2 100644
--- a/src/commonMain/kotlin/com/infendro/hash/blake2/Blake2b.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/blake2/Blake2b.kt
@@ -9,7 +9,7 @@ class Blake2b(
     override val bytes: Int,
 ) : HashFunction {
     init {
-        if (bytes !in 1..64) throw IllegalArgumentException()
+        require(bytes in 1..64)
     }
 
     override val block: Int
diff --git a/src/commonMain/kotlin/com/infendro/hash/blake2/Blake2s.kt b/src/commonMain/kotlin/com/infendro/hash/blake2/Blake2s.kt
index 63460eb..3b54b4c 100644
--- a/src/commonMain/kotlin/com/infendro/hash/blake2/Blake2s.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/blake2/Blake2s.kt
@@ -9,7 +9,7 @@ class Blake2s(
     override val bytes: Int,
 ) : HashFunction {
     init {
-        if (bytes !in 1..32) throw IllegalArgumentException()
+        require(bytes in 1..32)
     }
 
     override val block: Int