diff --git a/mkspecs/features/moc.prf b/mkspecs/features/moc.prf
index 282d215a602..3b0e511edb7 100644
--- a/mkspecs/features/moc.prf
+++ b/mkspecs/features/moc.prf
@@ -47,7 +47,7 @@ defineReplace(mocCmdBase) {
     } else {
         incvar = $(INCPATH)
     }
-    RET += $$QMAKE_MOC $(DEFINES) $$incvar $$join(QMAKE_COMPILER_DEFINES, " -D", -D) $$QMAKE_MOC_OPTIONS
+    RET += $$QMAKE_MOC $(DEFINES) $$join(QMAKE_COMPILER_DEFINES, " -D", -D) $$incvar $$join(QMAKE_DEFAULT_INCDIRS, " -I", -I) $$QMAKE_MOC_OPTIONS
     return($$RET)
 }