diff --git a/Makefile b/Makefile
index a0e7d90ad..ae645f4b2 100644
--- a/Makefile
+++ b/Makefile
@@ -91,14 +91,14 @@ build/%.woff: build/%.ttf
 
 # Master UFOs -> variable TTF
 $(FONTDIR)/var/%.var.ttf: src/%.designspace $(all_ufo_masters)
-	misc/fontbuild compile-var -o $@ $<
+	misc/fontbuild compile-var -o $@ $(FONTBUILD_FLAGS) $<
 
 # Instance UFO -> OTF, TTF (note: masters' rules in generated.make)
 $(FONTDIR)/const/Inter-%.otf: build/ufo/Inter-%.ufo
-	misc/fontbuild compile -o $@ $<
+	misc/fontbuild compile -o $@ $(FONTBUILD_FLAGS) $<
 
 $(FONTDIR)/const/Inter-%.ttf: build/ufo/Inter-%.ufo
-	misc/fontbuild compile -o $@ $<
+	misc/fontbuild compile -o $@ $(FONTBUILD_FLAGS) $<
 
 
 # designspace <- glyphs file
diff --git a/init.sh b/init.sh
index 0323054c4..a82274343 100755
--- a/init.sh
+++ b/init.sh
@@ -413,9 +413,9 @@ else
     # master OTF and TTF rules
     for style in "${master_styles[@]}"; do
       echo "${DIST_DIR_TOK}const/Inter-${style}.otf: \$(${style}_ufo_d)" >> "$GEN_MAKE_FILE"
-      echo -e "\tmisc/fontbuild compile -o \$@ src/Inter-${style}.ufo" >> "$GEN_MAKE_FILE"
+      echo -e "\tmisc/fontbuild compile -o \$@ \$(FONTBUILD_FLAGS) src/Inter-${style}.ufo" >> "$GEN_MAKE_FILE"
       echo "${DIST_DIR_TOK}const/Inter-${style}.ttf: \$(${style}_ufo_d)" >> "$GEN_MAKE_FILE"
-      echo -e "\tmisc/fontbuild compile -o \$@ src/Inter-${style}.ufo" >> "$GEN_MAKE_FILE"
+      echo -e "\tmisc/fontbuild compile -o \$@ \$(FONTBUILD_FLAGS) src/Inter-${style}.ufo" >> "$GEN_MAKE_FILE"
       echo "" >> "$GEN_MAKE_FILE"
     done