diff --git a/spack-environment/Makefile b/spack-environment/Makefile
index 713dbef0ef893274371d84efc8a0a4b36ba4c3a1..da88e89929a76d451e668435b4efc6d1a5e8dec1 100644
--- a/spack-environment/Makefile
+++ b/spack-environment/Makefile
@@ -30,7 +30,7 @@ $(SPACK_ENV)/spack.lock: $(SPACK_ENV)/spack.yaml Makefile
 	$(SPACK) concretize --force --fresh
 
 $(SPACK_ENV)/spack.mk: $(SPACK_ENV)/spack.lock Makefile
-	$(SPACK) env depfile --output $@ --make-prefix $(SPACK_ENV)
+	$(SPACK) env depfile --output $@ --make-target-prefix $(SPACK_ENV)
 
 clean:
 	rm -rf $(SPACK_ENV)/spack.lock $(SPACK_ENV)/spack.mk