diff --git a/tools/firmware/ovmf-makefile b/tools/firmware/ovmf-makefile
index 2838744461..3de2fc0300 100644
--- a/tools/firmware/ovmf-makefile
+++ b/tools/firmware/ovmf-makefile
@@ -16,6 +16,7 @@ all: build
 
 .PHONY: build
 build:
+	$(GIT) submodule update --init --recursive
 	OvmfPkg/build.sh -a X64 -b $(TARGET) -n 4
 	cp Build/OvmfX64/$(TARGET)_GCC*/FV/OVMF.fd ovmf.bin