diff --git a/classes-recipe/rust-target-config.bbclass b/classes-recipe/rust-target-config.bbclass
index 41e5362..73f13fd 100644
--- a/classes-recipe/rust-target-config.bbclass
+++ b/classes-recipe/rust-target-config.bbclass
@@ -416,7 +416,7 @@ def rust_gen_target(d, thing, wd, arch):
         json.dump(tspec, f, indent=4)
 
 # These are accounted for in tmpdir path names so don't need to be in the task sig
-rust_gen_target[vardepsexclude] += "ABIEXTENSION llvm_cpu"
+rust_gen_target[vardepsexclude] += "ABIEXTENSION llvm_cpu TUNE_RISCV_ABI"
 
 do_rust_gen_targets[vardeps] += "DATA_LAYOUT TARGET_ENDIAN TARGET_POINTER_WIDTH TARGET_C_INT_WIDTH MAX_ATOMIC_WIDTH FEATURES"