diff --git a/centroid.h b/centroid.h
index 1eb448f..d02a67a 100644
--- a/centroid.h
+++ b/centroid.h
@@ -4,4 +4,5 @@ struct centroid_t {
 	float location;
 	float size;
 	bool operator== (const centroid_t& other) { return !memcmp(this, &other, sizeof(other)); }
+	bool operator!= (const centroid_t& other) { return !(*this == other); }
 };