diff --git a/Sources/Hedera/Client/Client.swift b/Sources/Hedera/Client/Client.swift
index 24c28163..524f4214 100644
--- a/Sources/Hedera/Client/Client.swift
+++ b/Sources/Hedera/Client/Client.swift
@@ -340,7 +340,7 @@ public final class Client: Sendable {
     /// # Panics
     /// - if amount is negative
     public func setDefaultMaxTransactionFee(_ amount: Hbar) throws {
-        assert(amount.toTinybars() < 0, "Default max transaction fee cannot be set to a negative value.")
+        assert(amount.toTinybars() >= 0, "Default max transaction fee cannot be set to a negative value.")
 
         self.maxTransactionFeeInner.store(amount.toTinybars(), ordering: .relaxed)
     }