diff --git a/src/plugins/coreplugin/editormanager/editormanager_p.h b/src/plugins/coreplugin/editormanager/editormanager_p.h
index 8c6619ffc2a..2a88a5daaaa 100644
--- a/src/plugins/coreplugin/editormanager/editormanager_p.h
+++ b/src/plugins/coreplugin/editormanager/editormanager_p.h
@@ -33,7 +33,6 @@
 #include "ieditorfactory.h"
 
 #include <coreplugin/idocument.h>
-#include <utils/mimetypes/mimedatabase.h>
 
 #include <QList>
 #include <QObject>
@@ -278,50 +277,5 @@ private:
     QList<std::function<bool(IEditor *)>> m_closeEditorListeners;
 };
 
-/* For something that has a 'QStringList mimeTypes' (IEditorFactory
- * or IExternalEditor), find the one best matching the mimetype passed in.
- *  Recurse over the parent classes of the mimetype to find them. */
-template <class EditorFactoryLike>
-static void mimeTypeFactoryLookup(const Utils::MimeType &mimeType,
-                                     const QList<EditorFactoryLike*> &allFactories,
-                                     QList<EditorFactoryLike*> *list)
-{
-    QSet<EditorFactoryLike *> matches;
-    // search breadth-first through parent hierarchy, e.g. for hierarchy
-    // * application/x-ruby
-    //     * application/x-executable
-    //         * application/octet-stream
-    //     * text/plain
-    QList<Utils::MimeType> queue;
-    QSet<QString> seen;
-    queue.append(mimeType);
-    seen.insert(mimeType.name());
-    while (!queue.isEmpty()) {
-        Utils::MimeType mt = queue.takeFirst();
-        // check for matching factories
-        foreach (EditorFactoryLike *factory, allFactories) {
-            if (!matches.contains(factory)) {
-                foreach (const QString &mimeName, factory->mimeTypes()) {
-                    if (mt.matchesName(mimeName)) {
-                        list->append(factory);
-                        matches.insert(factory);
-                    }
-                }
-            }
-        }
-        // add parent mime types
-        QStringList parentNames = mt.parentMimeTypes();
-        foreach (const QString &parentName, parentNames) {
-            const Utils::MimeType parent = Utils::mimeTypeForName(parentName);
-            if (parent.isValid()) {
-                int seenSize = seen.size();
-                seen.insert(parent.name());
-                if (seen.size() != seenSize) // not seen before, so add
-                    queue.append(parent);
-            }
-        }
-    }
-}
-
 } // Internal
 } // Core
diff --git a/src/plugins/coreplugin/editormanager/ieditorfactory.cpp b/src/plugins/coreplugin/editormanager/ieditorfactory.cpp
index fe21fb7a108..c889e39404d 100644
--- a/src/plugins/coreplugin/editormanager/ieditorfactory.cpp
+++ b/src/plugins/coreplugin/editormanager/ieditorfactory.cpp
@@ -26,7 +26,6 @@
 #include "ieditorfactory.h"
 #include "ieditorfactory_p.h"
 #include "editormanager.h"
-#include "editormanager_p.h"
 
 #include <utils/mimetypes/mimedatabase.h>
 #include <utils/qtcassert.h>
diff --git a/src/plugins/coreplugin/editormanager/ieditorfactory_p.h b/src/plugins/coreplugin/editormanager/ieditorfactory_p.h
index 74cd0ca029e..3da7cf2fa90 100644
--- a/src/plugins/coreplugin/editormanager/ieditorfactory_p.h
+++ b/src/plugins/coreplugin/editormanager/ieditorfactory_p.h
@@ -26,8 +26,10 @@
 #pragma once
 
 #include <utils/mimetypes/mimetype.h>
+#include <utils/mimetypes/mimedatabase.h>
 
 #include <QHash>
+#include <QSet>
 
 namespace Core {
 
@@ -38,5 +40,50 @@ namespace Internal {
 QHash<Utils::MimeType, IEditorFactory *> userPreferredEditorFactories();
 void setUserPreferredEditorFactories(const QHash<Utils::MimeType, IEditorFactory *> &factories);
 
+/* For something that has a 'QStringList mimeTypes' (IEditorFactory
+ * or IExternalEditor), find the one best matching the mimetype passed in.
+ *  Recurse over the parent classes of the mimetype to find them. */
+template <class EditorFactoryLike>
+static void mimeTypeFactoryLookup(const Utils::MimeType &mimeType,
+                                     const QList<EditorFactoryLike*> &allFactories,
+                                     QList<EditorFactoryLike*> *list)
+{
+    QSet<EditorFactoryLike *> matches;
+    // search breadth-first through parent hierarchy, e.g. for hierarchy
+    // * application/x-ruby
+    //     * application/x-executable
+    //         * application/octet-stream
+    //     * text/plain
+    QList<Utils::MimeType> queue;
+    QSet<QString> seen;
+    queue.append(mimeType);
+    seen.insert(mimeType.name());
+    while (!queue.isEmpty()) {
+        Utils::MimeType mt = queue.takeFirst();
+        // check for matching factories
+        foreach (EditorFactoryLike *factory, allFactories) {
+            if (!matches.contains(factory)) {
+                foreach (const QString &mimeName, factory->mimeTypes()) {
+                    if (mt.matchesName(mimeName)) {
+                        list->append(factory);
+                        matches.insert(factory);
+                    }
+                }
+            }
+        }
+        // add parent mime types
+        QStringList parentNames = mt.parentMimeTypes();
+        foreach (const QString &parentName, parentNames) {
+            const Utils::MimeType parent = Utils::mimeTypeForName(parentName);
+            if (parent.isValid()) {
+                int seenSize = seen.size();
+                seen.insert(parent.name());
+                if (seen.size() != seenSize) // not seen before, so add
+                    queue.append(parent);
+            }
+        }
+    }
+}
+
 } // Internal
 } // Core
diff --git a/src/plugins/coreplugin/editormanager/iexternaleditor.cpp b/src/plugins/coreplugin/editormanager/iexternaleditor.cpp
index 13d21e22ce3..9fdb561587f 100644
--- a/src/plugins/coreplugin/editormanager/iexternaleditor.cpp
+++ b/src/plugins/coreplugin/editormanager/iexternaleditor.cpp
@@ -25,7 +25,7 @@
 
 #include "iexternaleditor.h"
 
-#include "editormanager_p.h"
+#include "ieditorfactory_p.h"
 
 namespace Core {