diff --git a/easystacks/software.eessi.io/2026.06/additional_arch/riscv64/generic/eessi-2026.06-eb-5.4.0-2026.1.yml b/easystacks/software.eessi.io/2026.06/additional_arch/riscv64/generic/eessi-2026.06-eb-5.4.0-2026.1.yml
new file mode 100644
index 0000000000..2c1363185c
--- /dev/null
+++ b/easystacks/software.eessi.io/2026.06/additional_arch/riscv64/generic/eessi-2026.06-eb-5.4.0-2026.1.yml
@@ -0,0 +1,5 @@
+easyconfigs:
+  - LLVM-21.1.8-GCCcore-15.2.0.eb:
+     options:
+        # see https://github.com/easybuilders/easybuild-easyblocks/pull/4178
+        include-easyblocks-from-commit: 1e945d5f38bfefda6ef3ce9443e1890a80b644aa