diff --git a/src/plugins/nim/editor/nimcompletionassistprovider.cpp b/src/plugins/nim/editor/nimcompletionassistprovider.cpp
index 96080fba7d9..ec7544bfed3 100644
--- a/src/plugins/nim/editor/nimcompletionassistprovider.cpp
+++ b/src/plugins/nim/editor/nimcompletionassistprovider.cpp
@@ -274,7 +274,7 @@ int NimCompletionAssistProvider::activationCharSequenceLength() const
 
 bool NimCompletionAssistProvider::isActivationCharSequence(const QString &sequence) const
 {
-    return sequence.size() && isActivationChar(sequence.front());
+    return !sequence.isEmpty() && isActivationChar(sequence.at(0));
 }
 
 IAssistProvider::RunType NimCompletionAssistProvider::runType() const