diff --git a/Makefile b/Makefile
index 05db819..383036d 100644
--- a/Makefile
+++ b/Makefile
@@ -53,7 +53,7 @@ i18n/Makefile: i18n/i18n.pro
 locales/Makefile: locales/locales.pro
 
 $(addsuffix /Makefile,$(QT_SUBDIRS)): %/Makefile :
-	cd $*; $(QMAKE) QMAKE=$(QMAKE) -o $(@F) $(<F)
+	cd $*; $(QMAKE) QMAKE=$(QMAKE) PREFIX=${PREFIX} -o $(@F) $(<F)
 
 $(SUBDIRS): $(addsuffix /Makefile,$(SUBDIRS)) version.cpp
 	$(MAKE) -C $@
