diff --git a/Makefile b/Makefile
index d74a059ac..2e9924c71 100644
--- a/Makefile
+++ b/Makefile
@@ -72,9 +72,11 @@ build/%.woff: build/%.ttf
 # 	ttf2eot "$<" > "$@"
 
 
-# UFO -> OTF, TTF
+# Master UFO -> OTF, TTF
 
-$(FONTDIR)/var/Inter-UI.var.ttf: src/Inter-UI.designspace $(Regular_ufo_d) $(Black_ufo_d)
+all_ufo_masters = $(Regular_ufo_d) $(Black_ufo_d) $(Italic_ufo_d) $(BlackItalic_ufo_d)
+
+$(FONTDIR)/var/Inter-UI.var.ttf: src/Inter-UI.designspace $(all_ufo_masters)
 	misc/fontbuild compile-var -o $@ src/Inter-UI.designspace
 
 $(FONTDIR)/const/Inter-UI-Regular.%: src/Inter-UI.designspace $(Regular_ufo_d)
@@ -89,10 +91,12 @@ $(FONTDIR)/const/Inter-UI-Italic.%: src/Inter-UI.designspace $(Italic_ufo_d)
 $(FONTDIR)/const/Inter-UI-BlackItalic.%: src/Inter-UI.designspace $(BlackItalic_ufo_d)
 	misc/fontbuild compile -o $@ src/Inter-UI-BlackItalic.ufo
 
-$(FONTDIR)/const/Inter-UI-%.otf: build/ufo/Inter-UI-%.ufo src/Inter-UI.designspace $(Regular_ufo_d) $(Black_ufo_d)
+# Instance UFO -> OTF, TTF
+
+$(FONTDIR)/const/Inter-UI-%.otf: build/ufo/Inter-UI-%.ufo src/Inter-UI.designspace $(all_ufo_masters)
 	misc/fontbuild compile -o $@ $<
 
-$(FONTDIR)/const/Inter-UI-%.ttf: build/ufo/Inter-UI-%.ufo src/Inter-UI.designspace $(Regular_ufo_d) $(Black_ufo_d)
+$(FONTDIR)/const/Inter-UI-%.ttf: build/ufo/Inter-UI-%.ufo src/Inter-UI.designspace $(all_ufo_masters)
 	misc/fontbuild compile -o $@ $<