diff --git a/mkspecs/features/qt_plugin.prf b/mkspecs/features/qt_plugin.prf
index 52567eaff07..b012278bde3 100644
--- a/mkspecs/features/qt_plugin.prf
+++ b/mkspecs/features/qt_plugin.prf
@@ -38,7 +38,7 @@ CONFIG(static, static|shared) {
     !build_pass {
         MODULE_PRI_CONT = \
             "QT_PLUGIN.$${MODULE}.TYPE = $$PLUGIN_TYPE" \
-            "QT_PLUGIN.$${MODULE}.EXTENDS = $$PLUGIN_EXTENDS" \
+            "QT_PLUGIN.$${MODULE}.EXTENDS =$$join(PLUGIN_EXTENDS, " ", " ")" \
             "QT_PLUGIN.$${MODULE}.CLASS_NAME = $$PLUGIN_CLASS_NAME" \
             "QT_PLUGINS += $$MODULE"
         write_file($$MODULE_PRI, MODULE_PRI_CONT)|error("Aborting.")