diff --git a/libs/stream/textstream.h b/libs/stream/textstream.h
index 083026bc..96fc7a6a 100644
--- a/libs/stream/textstream.h
+++ b/libs/stream/textstream.h
@@ -32,6 +32,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include <cmath>
 #include <stdio.h>
 #include <string.h>
+#include <algorithm>
 
 #include "generic/arrayrange.h"