diff --git a/src/stats.h b/src/stats.h
index f568b23..9377cc2 100644
--- a/src/stats.h
+++ b/src/stats.h
@@ -94,7 +94,7 @@ class Stats{
     long mKmerMax;
     long mKmerMin;
     int mKmerBufLen;
-    int mLengthSum;
+    long mLengthSum;
 };
 
 #endif
\ No newline at end of file