diff --git a/utils/GPSsmooth/UGear_main.cxx b/utils/GPSsmooth/UGear_main.cxx
index 900ac483a..bad1a9bf6 100644
--- a/utils/GPSsmooth/UGear_main.cxx
+++ b/utils/GPSsmooth/UGear_main.cxx
@@ -2,6 +2,7 @@
 #  include <config.h>
 #endif
 
+#include <strings.h>		// for bzero()
 #include <iostream>
 #include <string>