diff --git a/inc/file_cache_row.h b/inc/file_cache_row.h
index dd49a52..c9fc2f0 100644
--- a/inc/file_cache_row.h
+++ b/inc/file_cache_row.h
@@ -1,6 +1,7 @@
 #include <string>
 #include <vector>
 #include <unordered_map>
+#include <math.h>
 struct file_cache_row
 {
     enum CacheStatus{INVALID,DOWNLOADING,UPLOADING,AVAILABLE,DOWNLOAD_PAUSED};