diff --git a/source/include/signalflow/node/processors/smooth.h b/source/include/signalflow/node/processors/smooth.h
index f1147155..0d341944 100644
--- a/source/include/signalflow/node/processors/smooth.h
+++ b/source/include/signalflow/node/processors/smooth.h
@@ -2,6 +2,7 @@
 
 #include "signalflow/core/constants.h"
 #include "signalflow/node/node.h"
+#include <limits>
 
 namespace signalflow
 {