diff --git a/crates/parser/src/conversion.rs b/crates/parser/src/conversion.rs
index 6045db1..be6a4e5 100644
--- a/crates/parser/src/conversion.rs
+++ b/crates/parser/src/conversion.rs
@@ -226,7 +226,6 @@ pub fn process_const_operator(op: wasmparser::Operator) -> Result<ConstInstructi
     match op {
         wasmparser::Operator::RefNull { ty } => Ok(ConstInstruction::RefNull(convert_valtype(&ty))),
         wasmparser::Operator::RefFunc { function_index } => Ok(ConstInstruction::RefFunc(function_index)),
-
         wasmparser::Operator::I32Const { value } => Ok(ConstInstruction::I32Const(value)),
         wasmparser::Operator::I64Const { value } => Ok(ConstInstruction::I64Const(value)),
         wasmparser::Operator::F32Const { value } => Ok(ConstInstruction::F32Const(f32::from_bits(value.bits()))), // TODO: check if this is correct
diff --git a/crates/tinywasm/src/store.rs b/crates/tinywasm/src/store.rs
index 9c4e7e6..b4ba086 100644
--- a/crates/tinywasm/src/store.rs
+++ b/crates/tinywasm/src/store.rs
@@ -335,7 +335,7 @@ impl Store {
                 let val = global.borrow().value;
                 val
             }
-            RefNull(_) => RawWasmValue::from(0),
+            RefNull(t) => RawWasmValue::from(t.default_value()),
             RefFunc(idx) => RawWasmValue::from(*idx as i64),
         };
         Ok(val)
diff --git a/crates/tinywasm/tests/generated/mvp.csv b/crates/tinywasm/tests/generated/mvp.csv
index eee0b45..85fdd92 100644
--- a/crates/tinywasm/tests/generated/mvp.csv
+++ b/crates/tinywasm/tests/generated/mvp.csv
@@ -2,4 +2,4 @@
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 0.1.0,17630,2598,[{"name":"address.wast","passed":5,"failed":255},{"name":"align.wast","passed":108,"failed":48},{"name":"binary-leb128.wast","passed":91,"failed":0},{"name":"binary.wast","passed":110,"failed":2},{"name":"block.wast","passed":193,"failed":30},{"name":"br.wast","passed":84,"failed":13},{"name":"br_if.wast","passed":90,"failed":28},{"name":"br_table.wast","passed":25,"failed":149},{"name":"call.wast","passed":29,"failed":62},{"name":"call_indirect.wast","passed":36,"failed":134},{"name":"comments.wast","passed":7,"failed":1},{"name":"const.wast","passed":778,"failed":0},{"name":"conversions.wast","passed":371,"failed":248},{"name":"custom.wast","passed":11,"failed":0},{"name":"data.wast","passed":47,"failed":14},{"name":"elem.wast","passed":50,"failed":49},{"name":"endianness.wast","passed":1,"failed":68},{"name":"exports.wast","passed":92,"failed":4},{"name":"f32.wast","passed":2514,"failed":0},{"name":"f32_bitwise.wast","passed":364,"failed":0},{"name":"f32_cmp.wast","passed":2407,"failed":0},{"name":"f64.wast","passed":2514,"failed":0},{"name":"f64_bitwise.wast","passed":364,"failed":0},{"name":"f64_cmp.wast","passed":2407,"failed":0},{"name":"fac.wast","passed":2,"failed":6},{"name":"float_exprs.wast","passed":761,"failed":139},{"name":"float_literals.wast","passed":163,"failed":0},{"name":"float_memory.wast","passed":6,"failed":84},{"name":"float_misc.wast","passed":437,"failed":4},{"name":"forward.wast","passed":1,"failed":4},{"name":"func.wast","passed":124,"failed":48},{"name":"func_ptrs.wast","passed":10,"failed":26},{"name":"global.wast","passed":51,"failed":59},{"name":"i32.wast","passed":460,"failed":0},{"name":"i64.wast","passed":416,"failed":0},{"name":"if.wast","passed":120,"failed":121},{"name":"imports.wast","passed":74,"failed":109},{"name":"inline-module.wast","passed":1,"failed":0},{"name":"int_exprs.wast","passed":108,"failed":0},{"name":"int_literals.wast","passed":51,"failed":0},{"name":"labels.wast","passed":14,"failed":15},{"name":"left-to-right.wast","passed":1,"failed":95},{"name":"linking.wast","passed":21,"failed":111},{"name":"load.wast","passed":60,"failed":37},{"name":"local_get.wast","passed":32,"failed":4},{"name":"local_set.wast","passed":50,"failed":3},{"name":"local_tee.wast","passed":68,"failed":29},{"name":"loop.wast","passed":93,"failed":27},{"name":"memory.wast","passed":34,"failed":45},{"name":"memory_grow.wast","passed":12,"failed":84},{"name":"memory_redundancy.wast","passed":1,"failed":7},{"name":"memory_size.wast","passed":6,"failed":36},{"name":"memory_trap.wast","passed":2,"failed":180},{"name":"names.wast","passed":485,"failed":1},{"name":"nop.wast","passed":46,"failed":42},{"name":"return.wast","passed":73,"failed":11},{"name":"select.wast","passed":86,"failed":62},{"name":"skip-stack-guard-page.wast","passed":1,"failed":10},{"name":"stack.wast","passed":2,"failed":5},{"name":"start.wast","passed":9,"failed":11},{"name":"store.wast","passed":59,"failed":9},{"name":"switch.wast","passed":2,"failed":26},{"name":"token.wast","passed":58,"failed":0},{"name":"traps.wast","passed":22,"failed":14},{"name":"type.wast","passed":3,"failed":0},{"name":"unreachable.wast","passed":50,"failed":14},{"name":"unreached-invalid.wast","passed":118,"failed":0},{"name":"unwind.wast","passed":35,"failed":15},{"name":"utf8-custom-section-id.wast","passed":176,"failed":0},{"name":"utf8-import-field.wast","passed":176,"failed":0},{"name":"utf8-import-module.wast","passed":176,"failed":0},{"name":"utf8-invalid-encoding.wast","passed":176,"failed":0}]
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diff --git a/crates/tinywasm/tests/generated/progress-mvp.svg b/crates/tinywasm/tests/generated/progress-mvp.svg
index 8a0128f..a7c27e4 100644
--- a/crates/tinywasm/tests/generated/progress-mvp.svg
+++ b/crates/tinywasm/tests/generated/progress-mvp.svg
@@ -12,7 +12,7 @@ TinyWasm Version
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 <rect x="266" y="185" width="172" height="159" opacity="0.5" fill="#0000FF" stroke="none"/>
+<rect x="630" y="68" width="172" height="276" opacity="0.5" fill="#0000FF" stroke="none"/>
+<rect x="448" y="92" width="172" height="252" opacity="0.5" fill="#0000FF" stroke="none"/>
+<rect x="85" y="212" width="171" height="132" opacity="0.5" fill="#0000FF" stroke="none"/>
 </svg>
diff --git a/crates/wasm-testsuite/lib.rs b/crates/wasm-testsuite/lib.rs
index 9e38bfc..e3352fb 100644
--- a/crates/wasm-testsuite/lib.rs
+++ b/crates/wasm-testsuite/lib.rs
@@ -2,10 +2,7 @@
 #![forbid(unsafe_code)]
 #![doc(test(
     no_crate_inject,
-    attr(
-        deny(warnings, rust_2018_idioms),
-        allow(dead_code, unused_assignments, unused_variables)
-    )
+    attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_assignments, unused_variables))
 ))]
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms, unreachable_pub)]
 
@@ -26,7 +23,7 @@ pub const PROPOSALS: &[&str] = &["annotations", "exception-handling", "memory64"
 /// List of all tests that apply to the MVP (V1) spec.
 /// Note that the tests are still for the latest spec, so the latest version of Wast is used.
 #[rustfmt::skip]  // removed: "break-drop.wast",
-pub const MVP_TESTS: &[&str] = &["address.wast","align.wast","binary-leb128.wast","binary.wast","block.wast","br.wast","br_if.wast","br_table.wast","call.wast","call_indirect.wast","comments.wast","const.wast","conversions.wast","custom.wast","data.wast","elem.wast","endianness.wast","exports.wast","f32.wast","f32_bitwise.wast","f32_cmp.wast","f64.wast","f64_bitwise.wast","f64_cmp.wast","fac.wast","float_exprs.wast","float_literals.wast","float_memory.wast","float_misc.wast","forward.wast","func.wast","func_ptrs.wast","global.wast","i32.wast","i64.wast","if.wast","imports.wast","inline-module.wast","int_exprs.wast","int_literals.wast","labels.wast","left-to-right.wast","linking.wast","load.wast","local_get.wast","local_set.wast","local_tee.wast","loop.wast","memory.wast","memory_grow.wast","memory_redundancy.wast","memory_size.wast","memory_trap.wast","names.wast","nop.wast","return.wast","select.wast","skip-stack-guard-page.wast","stack.wast","start.wast","store.wast","switch.wast","token.wast","traps.wast","type.wast","unreachable.wast","unreached-invalid.wast","unwind.wast","utf8-custom-section-id.wast","utf8-import-field.wast","utf8-import-module.wast","utf8-invalid-encoding.wast"];
+pub const MVP_TESTS: &[&str] = &["address.wast","align.wast","binary-leb128.wast","binary.wast","block.wast","br.wast","br_if.wast","br_table.wast","call.wast","call_indirect.wast","comments.wast","const.wast","conversions.wast","custom.wast","data.wast","elem.wast","endianness.wast","exports.wast","f32.wast","f32_bitwise.wast","f32_cmp.wast","f64.wast","f64_bitwise.wast","f64_cmp.wast","fac.wast","float_exprs.wast","float_literals.wast","float_memory.wast","float_misc.wast","forward.wast","func.wast","func_ptrs.wast","global.wast","i32.wast","i64.wast","if.wast","imports.wast","inline-module.wast","int_exprs.wast","int_literals.wast","labels.wast","left-to-right.wast","linking.wast","load.wast","local_get.wast","local_set.wast","local_tee.wast","loop.wast","memory.wast","memory_grow.wast","memory_redundancy.wast","memory_size.wast","memory_trap.wast","names.wast","nop.wast","return.wast","select.wast","skip-stack-guard-page.wast","stack.wast","start.wast","store.wast","switch.wast","table.wast","token.wast","traps.wast","type.wast","unreachable.wast","unreached-valid.wast","unreached-invalid.wast","unwind.wast","utf8-custom-section-id.wast","utf8-import-field.wast","utf8-import-module.wast","utf8-invalid-encoding.wast"];
 
 /// List of all tests that apply to the V2 draft 1 spec.
 #[rustfmt::skip]