diff --git a/src/plugins/diffeditor/differ.cpp b/src/plugins/diffeditor/differ.cpp
index fba5a4076e3..0cc269be877 100644
--- a/src/plugins/diffeditor/differ.cpp
+++ b/src/plugins/diffeditor/differ.cpp
@@ -298,7 +298,7 @@ void Differ::setDiffMode(Differ::DiffMode mode)
     m_diffMode = mode;
 }
 
-bool Differ::diffMode() const
+Differ::DiffMode Differ::diffMode() const
 {
     return m_diffMode;
 }
diff --git a/src/plugins/diffeditor/differ.h b/src/plugins/diffeditor/differ.h
index 1387632755c..e0df7050625 100644
--- a/src/plugins/diffeditor/differ.h
+++ b/src/plugins/diffeditor/differ.h
@@ -70,7 +70,7 @@ public:
     Differ();
     QList<Diff> diff(const QString &text1, const QString &text2);
     void setDiffMode(DiffMode mode);
-    bool diffMode() const;
+    DiffMode diffMode() const;
     static QList<Diff> merge(const QList<Diff> &diffList);
     static QList<Diff> cleanupSemantics(const QList<Diff> &diffList);
     static QList<Diff> cleanupSemanticsLossless(const QList<Diff> &diffList);