diff --git a/emper/Debug.cpp b/emper/Debug.cpp
index 93aaa2430431a3d488e5b62a4834a7d16b64d2da..953fef6ffe30d92cc77752cf203c0d953803b288 100644
--- a/emper/Debug.cpp
+++ b/emper/Debug.cpp
@@ -33,7 +33,7 @@ void emper_add_timestamp_to(std::ostringstream& logMessage) {
 	auto time_since_epoch = now_nanos.time_since_epoch();
 	long time_since_epoch_long = time_since_epoch.count();
 
-	long remaining_nanos = time_since_epoch_long % 1000000000;
+	long remaining_nanos = time_since_epoch_long % 60000000000;
 	logMessage << remaining_nanos;
 }