diff --git a/Legacy/BootSector/Makefile b/Legacy/BootSector/Makefile
index 12f60c34..577f56c9 100644
--- a/Legacy/BootSector/Makefile
+++ b/Legacy/BootSector/Makefile
@@ -10,6 +10,10 @@ PRODUCTS64=$(BINDIR)/StartX64_$(PAGE_TABLE).com $(BINDIR)/StartX64_$(PAGE_TABLE_
 
 all: $(PRODUCTS32) $(PRODUCTS64)
 
+IA32: $(PRODUCTS32)
+
+X64: $(PRODUCTS64)
+
 clean:
 	$(RM) -f $(BINDIR)/*.com
 
diff --git a/build_duet.tool b/build_duet.tool
index 8d4e4953..309e7e56 100755
--- a/build_duet.tool
+++ b/build_duet.tool
@@ -77,7 +77,7 @@ imgbuild() {
   # Build bootsectors.
   mkdir -p "${BOOTSECTORS}" || exit 1
   cd "${BOOTSECTORS}"/.. || exit 1
-  make || exit 1
+  make "${arch}" || exit 1
   cd - || exit 1
 
   # Concatenate bootsector into the resulting image.