diff --git a/package/qextserialport/qextserialport.mk b/package/qextserialport/qextserialport.mk
index 39e04075b7..11b1cc89c7 100644
--- a/package/qextserialport/qextserialport.mk
+++ b/package/qextserialport/qextserialport.mk
@@ -12,16 +12,16 @@ QEXTSERIALPORT_INSTALL_STAGING = YES
 
 ifeq ($(BR2_PACKAGE_QT),y)
 QEXTSERIALPORT_DEPENDENCIES += qt
-define QEXTSERIALPORT_CONFIGURE_CMDS
-	(cd $(@D); $(TARGET_MAKE_ENV) $(QT_QMAKE))
-endef
+QEXTSERIALPORT_QMAKE = $(QT_QMAKE)
 else ifeq ($(BR2_PACKAGE_QT5),y)
 QEXTSERIALPORT_DEPENDENCIES += qt5base
-define QEXTSERIALPORT_CONFIGURE_CMDS
-	(cd $(@D); $(TARGET_MAKE_ENV) $(QT5_QMAKE))
-endef
+QEXTSERIALPORT_QMAKE = $(QT5_QMAKE)
 endif
 
+define QEXTSERIALPORT_CONFIGURE_CMDS
+	(cd $(@D); $(TARGET_MAKE_ENV) $(QEXTSERIALPORT_QMAKE))
+endef
+
 define QEXTSERIALPORT_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)
 endef