diff --git a/vaadin-combo-box-flow/src/main/java/com/vaadin/flow/component/combobox/ComboBox.java b/vaadin-combo-box-flow/src/main/java/com/vaadin/flow/component/combobox/ComboBox.java
index 61447b11..0c407178 100644
--- a/vaadin-combo-box-flow/src/main/java/com/vaadin/flow/component/combobox/ComboBox.java
+++ b/vaadin-combo-box-flow/src/main/java/com/vaadin/flow/component/combobox/ComboBox.java
@@ -520,9 +520,8 @@ public <C> void setDataProvider(DataProvider<T, C> dataProvider,
     }
 
     private void refreshAllData(boolean forceServerSideFiltering) {
-        int size = getDataProvider().size(new Query<>());
-        setClientSideFilter(
-                !forceServerSideFiltering && size <= getPageSizeDouble());
+        setClientSideFilter(!forceServerSideFiltering && getDataProvider()
+                .size(new Query<>()) <= getPageSizeDouble());
 
         reset();
     }