diff --git a/include/digest/digester.hpp b/include/digest/digester.hpp
index c0a5470..9491a28 100644
--- a/include/digest/digester.hpp
+++ b/include/digest/digester.hpp
@@ -207,7 +207,7 @@ template <BadCharPolicy P> class Digester {
 	 * @throws BadConstructionException thrown if the starting position is
 	 * greater than the length of the string
 	 */
-	void new_seq(const char *seq, size_t len, size_t start) {
+	virtual void new_seq(const char *seq, size_t len, size_t start) {
 		this->seq = seq;
 		this->len = len;
 		this->offset = 0;
@@ -231,7 +231,7 @@ template <BadCharPolicy P> class Digester {
 	 * @throws BadConstructionException thrown if the starting position is
 	 * greater than the length of the string
 	 */
-	void new_seq(const std::string &seq, size_t pos) {
+	virtual void new_seq(const std::string &seq, size_t pos) {
 		new_seq(seq.c_str(), seq.size(), pos);
 	}
 
diff --git a/include/digest/window_minimizer.hpp b/include/digest/window_minimizer.hpp
index d3811ce..6dbeef6 100644
--- a/include/digest/window_minimizer.hpp
+++ b/include/digest/window_minimizer.hpp
@@ -131,6 +131,16 @@ template <BadCharPolicy P, class T> class WindowMin : public Digester<P> {
 		}
 	}
 
+	void new_seq(const char *seq, size_t len, size_t start) override {
+		ds = T(large_window);
+		Digester<P>::new_seq(seq, len, start);
+	}
+
+	void new_seq(const std::string &seq, size_t pos) override {
+		ds = T(large_window);
+		Digester<P>::new_seq(seq.c_str(), seq.size(), pos);
+	}
+
 	/**
 	 *
 	 * @return unsigned, the value of large_window