diff --git a/src/ccutil/ocrclass.h b/src/ccutil/ocrclass.h
index d39a6dd..3755632 100644
--- a/src/ccutil/ocrclass.h
+++ b/src/ccutil/ocrclass.h
@@ -28,6 +28,9 @@
 
 #include <chrono>
 #include <ctime>
+#ifndef _WIN32
+#include <sys/time.h>
+#endif
 #ifdef _WIN32
 #include <winsock2.h> // for timeval
 #endif