diff --git a/src/libs/utils/completingtextedit.cpp b/src/libs/utils/completingtextedit.cpp
index b870995668f..6d7476e80f1 100644
--- a/src/libs/utils/completingtextedit.cpp
+++ b/src/libs/utils/completingtextedit.cpp
@@ -59,7 +59,10 @@ public:
     void insertCompletion(const QString &completion);
     QString textUnderCursor() const;
 
+    bool acceptsCompletionPrefix(const QString &prefix) const;
+
     QCompleter *m_completer;
+    int m_completionLengthThreshold;
 
 private:
     CompletingTextEdit *m_backPointer;
@@ -67,6 +70,7 @@ private:
 
 CompletingTextEditPrivate::CompletingTextEditPrivate(CompletingTextEdit *textEdit)
     : m_completer(0),
+      m_completionLengthThreshold(3),
       m_backPointer(textEdit)
 {
 }
@@ -90,6 +94,11 @@ QString CompletingTextEditPrivate::textUnderCursor() const
     return tc.selectedText();
 }
 
+bool CompletingTextEditPrivate::acceptsCompletionPrefix(const QString &prefix) const
+{
+    return prefix.length() >= m_completionLengthThreshold;
+}
+
 CompletingTextEdit::CompletingTextEdit(QWidget *parent)
     : QTextEdit(parent),
       d(new CompletingTextEditPrivate(this))
@@ -121,6 +130,16 @@ QCompleter *CompletingTextEdit::completer() const
     return d->m_completer;
 }
 
+int CompletingTextEdit::completionLengthThreshold() const
+{
+    return d->m_completionLengthThreshold;
+}
+
+void CompletingTextEdit::setCompletionLengthThreshold(int len)
+{
+    d->m_completionLengthThreshold = len;
+}
+
 void CompletingTextEdit::keyPressEvent(QKeyEvent *e)
 {
     if (completer() && completer()->popup()->isVisible()) {
@@ -150,8 +169,8 @@ void CompletingTextEdit::keyPressEvent(QKeyEvent *e)
     const QString newCompletionPrefix = d->textUnderCursor();
     const QChar lastChar = e->text().isEmpty() ? QChar() : e->text().right(1).at(0);
 
-    if (!isShortcut && (hasModifier || e->text().isEmpty() || newCompletionPrefix.length() < 3
-                        || isEndOfWordChar(lastChar))) {
+    if (!isShortcut && (hasModifier || e->text().isEmpty() || isEndOfWordChar(lastChar)
+                        || !d->acceptsCompletionPrefix(newCompletionPrefix))) {
         completer()->popup()->hide();
         return;
     }
diff --git a/src/libs/utils/completingtextedit.h b/src/libs/utils/completingtextedit.h
index 9c69150f357..dbe4259af56 100644
--- a/src/libs/utils/completingtextedit.h
+++ b/src/libs/utils/completingtextedit.h
@@ -46,6 +46,8 @@ namespace Utils {
 class QTCREATOR_UTILS_EXPORT CompletingTextEdit : public QTextEdit
 {
     Q_OBJECT
+    Q_PROPERTY(int completionLengthThreshold
+               READ completionLengthThreshold WRITE setCompletionLengthThreshold)
 
 public:
     CompletingTextEdit(QWidget *parent = 0);
@@ -54,6 +56,9 @@ public:
     void setCompleter(QCompleter *c);
     QCompleter *completer() const;
 
+    int completionLengthThreshold() const;
+    void setCompletionLengthThreshold(int len);
+
 protected:
     void keyPressEvent(QKeyEvent *e);
     void focusInEvent(QFocusEvent *e);