diff --git a/roms/Makefile b/roms/Makefile
index 8cafced348..d3a3228359 100644
--- a/roms/Makefile
+++ b/roms/Makefile
@@ -138,6 +138,7 @@ build-efi-roms: build-pxe-roms
 #    efirom
 #
 edk2-basetools:
+	cd edk2/BaseTools && git submodule update --init --force
 	$(MAKE) -C edk2/BaseTools \
 		PYTHON_COMMAND=$${EDK2_PYTHON_COMMAND:-python3} \
 		EXTRA_OPTFLAGS='$(EDK2_BASETOOLS_OPTFLAGS)' \
diff --git a/tests/uefi-test-tools/Makefile b/tests/uefi-test-tools/Makefile
index 1dcddcdbba..471f0de981 100644
--- a/tests/uefi-test-tools/Makefile
+++ b/tests/uefi-test-tools/Makefile
@@ -99,6 +99,7 @@ Build/bios-tables-test.%.efi: build-edk2-tools
 	+./build.sh $(edk2_dir) BiosTablesTest $* $@
 
 build-edk2-tools:
+	cd $(edk2_dir)/BaseTools && git submodule update --init --force
 	$(MAKE) -C $(edk2_dir)/BaseTools \
 		PYTHON_COMMAND=$${EDK2_PYTHON_COMMAND:-python3} \
 		EXTRA_OPTFLAGS='$(EDK2_BASETOOLS_OPTFLAGS)' \