diff --git a/debian/rules b/debian/rules
index 371fced51..6201bbb76 100755
--- a/debian/rules
+++ b/debian/rules
@@ -29,7 +29,7 @@ $(BUILD_FLAGS_FILE) verify-build-flags:
 	$(call $(flag_action),CMAKE_CXX_FLAGS,"$(CXXFLAGS)","C++ flags")
 	$(call $(flag_action),CMAKE_SKIP_BOOTSTRAP_TEST,ON,"Skip BootstrapTest")
 	$(call $(flag_action),BUILD_CursesDialog,ON,"Build curses GUI")
-ifeq (,$(findstring stage1,$(DEB_BUILD_PROFILES)))
+ifneq ($(filter stage1,$(DEB_BUILD_PROFILES)),)
 	$(call $(flag_action),BUILD_QtDialog,ON,"Build Qt GUI")
 endif
 #	$(call $(flag_action),BUILD_DOCUMENTATION,ON)