diff --git a/core/src/pow/mod.rs b/core/src/pow/mod.rs
index c1c1ffaec..809d6894d 100644
--- a/core/src/pow/mod.rs
+++ b/core/src/pow/mod.rs
@@ -98,7 +98,8 @@ pub fn pow_size(
 		}
 
 		// otherwise increment the nonce
-		bh.nonce += 1;
+		let (res, _) = bh.nonce.overflowing_add(1);
+		bh.nonce = res;
 
 		// and if we're back where we started, update the time (changes the hash as
 		// well)