diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 316dd25183..1cf1567472 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -1354,17 +1354,19 @@ scss_verbose = $(scss_verbose_@AM_V@)
 scss_verbose_ = $(scss_verbose_@AM_DEFAULT_V@)
 scss_verbose_0 = @echo "  SCSS     $@";
 
-theme/Adwaita/gtk-contained.css: $(top_srcdir)/gtk/theme/Adwaita/gtk-contained.scss
-	$(scss_verbose) $(MKDIR_P) $(dir $@) && $(SASSC) -a $< $@ || rm -f $@
+SASSC_OPTS = -a
 
-theme/Adwaita/gtk-contained-dark.css: $(top_srcdir)/gtk/theme/Adwaita/gtk-contained-dark.scss
-	$(scss_verbose) $(MKDIR_P) $(dir $@) && $(SASSC) -a $< $@ || rm -f $@
+theme/Adwaita/gtk-contained.css: $(top_srcdir)/gtk/theme/Adwaita/gtk-contained.scss $(adwaita_theme_scss)
+	$(scss_verbose) $(MKDIR_P) $(dir $@) && $(SASSC) $(SASSC_OPTS) $< $@ || rm -f $@
 
-theme/HighContrast/gtk-contained.css: $(top_srcdir)/gtk/theme/HighContrast/gtk-contained.scss
-	$(scss_verbose) $(MKDIR_P) $(dir $@) && $(SASSC) -a $< $@ || rm -f $@
+theme/Adwaita/gtk-contained-dark.css: $(top_srcdir)/gtk/theme/Adwaita/gtk-contained-dark.scss $(adwaita_theme_scss)
+	$(scss_verbose) $(MKDIR_P) $(dir $@) && $(SASSC) $(SASSC_OPTS) $< $@ || rm -f $@
 
-theme/HighContrast/gtk-contained-inverse.css: $(top_srcdir)/gtk/theme/HighContrast/gtk-contained-inverse.scss
-	$(scss_verbose) $(MKDIR_P) $(dir $@) && $(SASSC) -a $< $@ || rm -f $@
+theme/HighContrast/gtk-contained.css: $(top_srcdir)/gtk/theme/HighContrast/gtk-contained.scss $(highcontrast_theme_scss)
+	$(scss_verbose) $(MKDIR_P) $(dir $@) && $(SASSC) $(SASSC_OPTS) $< $@ || rm -f $@
+
+theme/HighContrast/gtk-contained-inverse.css: $(top_srcdir)/gtk/theme/HighContrast/gtk-contained-inverse.scss $(highcontrast_theme_scss)
+	$(scss_verbose) $(MKDIR_P) $(dir $@) && $(SASSC) $(SASSC_OPTS) $< $@ || rm -f $@
 
 endif # REBUILD_SCSS