diff --git a/autotests/extractorcollectiontest.cpp b/autotests/extractorcollectiontest.cpp
--- a/autotests/extractorcollectiontest.cpp
+++ b/autotests/extractorcollectiontest.cpp
@@ -39,6 +39,19 @@
         QVERIFY(collection.fetchExtractors("unknown/mimetype").isEmpty());
         QVERIFY(!collection.fetchExtractors("text/plain").isEmpty());
     }
+
+    void testMultipleExtractorCollections()
+    {
+        QCoreApplication::setLibraryPaths({QCoreApplication::applicationDirPath()});
+        ExtractorCollection collection;
+        QVERIFY(collection.fetchExtractors("unknown/mimetype").isEmpty());
+        QVERIFY(!collection.fetchExtractors("text/plain").isEmpty());
+        ExtractorCollection collection2;
+        QVERIFY(collection.fetchExtractors("unknown/mimetype").isEmpty());
+        QVERIFY(!collection.fetchExtractors("text/plain").isEmpty());
+        QVERIFY(collection2.fetchExtractors("unknown/mimetype").isEmpty());
+        QVERIFY(!collection2.fetchExtractors("text/plain").isEmpty());
+    }
 };
 
 QTEST_GUILESS_MAIN(ExtractorCollectionTest)
diff --git a/src/extractor.h b/src/extractor.h
--- a/src/extractor.h
+++ b/src/extractor.h
@@ -28,10 +28,17 @@
 
 class ExtractionResult;
 class ExtractorCollection;
-class ExtractorPrivate;
+class ExtractorPlugin;
 
 class KFILEMETADATA_EXPORT Extractor
 {
+    class ExtractorPrivate;
+
+    enum ExtractorPluginOwnership {
+        PluginOwner,
+        SharedPlugin,
+    };
+
 public:
     virtual ~Extractor();
 
@@ -44,6 +51,8 @@
 
     void operator =(const Extractor&);
 
+    void setExtractorPlugin(ExtractorPlugin *extractorPlugin, ExtractorPluginOwnership ownership);
+
     ExtractorPrivate *d;
     friend class ExtractorCollection;
 };
diff --git a/src/extractor.cpp b/src/extractor.cpp
--- a/src/extractor.cpp
+++ b/src/extractor.cpp
@@ -31,7 +31,10 @@
 
 Extractor::~Extractor()
 {
-    delete d->m_plugin;
+    if (d->m_pluginOwnership == PluginOwner) {
+        delete d->m_plugin;
+    }
+
     delete d;
 }
 
@@ -44,3 +47,9 @@
 {
     return d->m_plugin->mimetypes();
 }
+
+void Extractor::setExtractorPlugin(ExtractorPlugin *extractorPlugin, Extractor::ExtractorPluginOwnership ownership)
+{
+    d->m_plugin = extractorPlugin;
+    d->m_pluginOwnership = ownership;
+}
diff --git a/src/extractor_p.h b/src/extractor_p.h
--- a/src/extractor_p.h
+++ b/src/extractor_p.h
@@ -25,10 +25,12 @@
 
 class ExtractorPlugin;
 
-class ExtractorPrivate
+class Extractor::ExtractorPrivate
 {
 public:
     ExtractorPlugin *m_plugin;
+
+    ExtractorPluginOwnership m_pluginOwnership;
 };
 
 }
diff --git a/src/extractorcollection.cpp b/src/extractorcollection.cpp
--- a/src/extractorcollection.cpp
+++ b/src/extractorcollection.cpp
@@ -22,7 +22,6 @@
 #include "extractor.h"
 #include "extractorplugin.h"
 #include "extractorcollection.h"
-#include "extractor_p.h"
 #include "externalextractor.h"
 
 #include <QDebug>
@@ -120,7 +119,7 @@
             ExtractorPlugin* plugin = qobject_cast<ExtractorPlugin*>(obj);
             if (plugin) {
                 Extractor* ex= new Extractor;
-                ex->d->m_plugin = plugin;
+                ex->setExtractorPlugin(plugin, Extractor::SharedPlugin);
 
                 extractors << ex;
             } else {
@@ -136,7 +135,7 @@
     Q_FOREACH (const QString& externalPluginPath, externalPluginPaths) {
         ExternalExtractor *plugin = new ExternalExtractor(externalPluginPath);
         Extractor* extractor = new Extractor;
-        extractor->d->m_plugin = plugin;
+        extractor->setExtractorPlugin(plugin, Extractor::PluginOwner);
 
         extractors << extractor;
     }