diff --git a/code/espurna/filters/LastFilter.h b/code/espurna/filters/LastFilter.h
index 45cc50f6..9d5bb97d 100644
--- a/code/espurna/filters/LastFilter.h
+++ b/code/espurna/filters/LastFilter.h
@@ -13,6 +13,10 @@ public:
         _value = value;
     }
 
+    size_t capacity() const override {
+        return 1;
+    }
+
     void reset() override {
         _value = 0;
     }
diff --git a/code/espurna/filters/MaxFilter.h b/code/espurna/filters/MaxFilter.h
index f24a6a63..860c8ebd 100644
--- a/code/espurna/filters/MaxFilter.h
+++ b/code/espurna/filters/MaxFilter.h
@@ -15,6 +15,10 @@ public:
         _value = std::max(value, _value);
     }
 
+    size_t capacity() const override {
+        return 1;
+    }
+
     void reset() override {
         _value = 0;
     }