diff --git a/core/iwasm/interpreter/wasm_interp_fast.c b/core/iwasm/interpreter/wasm_interp_fast.c
index 36d4538ff..1c744f9a5 100644
--- a/core/iwasm/interpreter/wasm_interp_fast.c
+++ b/core/iwasm/interpreter/wasm_interp_fast.c
@@ -7528,6 +7528,9 @@ wasm_interp_call_func_bytecode(WASMModuleInstance *module,
         HANDLE_OP(EXT_OP_LOOP)
         HANDLE_OP(EXT_OP_IF)
         HANDLE_OP(EXT_OP_BR_TABLE_CACHE)
+#if WASM_ENABLE_SIMDE == 0
+        HANDLE_OP(WASM_OP_SIMD_PREFIX)
+#endif
         {
             wasm_set_exception(module, "unsupported opcode");
             goto got_exception;
diff --git a/tests/wamr-test-suites/test_wamr.sh b/tests/wamr-test-suites/test_wamr.sh
index 6f498653f..88af49f8f 100755
--- a/tests/wamr-test-suites/test_wamr.sh
+++ b/tests/wamr-test-suites/test_wamr.sh
@@ -449,10 +449,10 @@ function spec_test()
         echo "checkout spec from threads proposal"
 
         # check spec test cases for threads
-        git clone -b main --single-branch https://github.com/WebAssembly/threads.git spec
+        git clone -b main-legacy --single-branch https://github.com/WebAssembly/threads.git spec
         pushd spec
 
-        # May 31, 2012 [interpreter] implement atomic.wait and atomic.notify (#194)
+        # May 31, 2023 [interpreter] implement atomic.wait and atomic.notify (#194)
         git reset --hard 09f2831349bf409187abb6f7868482a8079f2264
         git apply --ignore-whitespace ../../spec-test-script/thread_proposal_ignore_cases.patch || exit 1
         git apply --ignore-whitespace ../../spec-test-script/thread_proposal_fix_atomic_case.patch || exit 1