diff --git a/src/plugins/languageclient/languageclientcompletionassist.cpp b/src/plugins/languageclient/languageclientcompletionassist.cpp
index 7919de0de81..7b2d4b02d45 100644
--- a/src/plugins/languageclient/languageclientcompletionassist.cpp
+++ b/src/plugins/languageclient/languageclientcompletionassist.cpp
@@ -347,11 +347,16 @@ public:
     {}
 
     // IAssistProposal interface
-    bool hasItemsToPropose(const QString &/*text*/, AssistReason reason) const override
+    bool hasItemsToPropose(const QString &prefix, AssistReason reason) const override
     {
         if (m_model->size() <= 0 || m_document.isNull())
             return false;
 
+        if (!prefix.isEmpty()) {
+            m_model->filter(prefix);
+            m_model->setPrefilterPrefix(prefix);
+        }
+
         return m_model->keepPerfectMatch(reason)
                 || !Utils::anyOf(m_model->items(), [this](AssistProposalItemInterface *item){
             if (const auto lcItem = dynamic_cast<LanguageClientCompletionItem *>(item))