diff --git a/src/c-writer.cc b/src/c-writer.cc
index 9dec2148c..96b79554e 100644
--- a/src/c-writer.cc
+++ b/src/c-writer.cc
@@ -1251,11 +1251,13 @@ void CWriter::Write(const Const& const_) {
       break;
 
     case Type::F32:
-      Writef("f32_reinterpret_i32(0x%" PRIx32 ")", const_.f32_bits());
+      Writef("f32_reinterpret_i32(0x%" PRIx32 " /* %.9g */)", const_.f32_bits(),
+             Bitcast<float>(const_.f32_bits()));
       break;
 
     case Type::F64:
-      Writef("f64_reinterpret_i64(0x%" PRIx64 ")", const_.f64_bits());
+      Writef("f64_reinterpret_i64(0x%" PRIx64 " /* %.17g */)",
+             const_.f64_bits(), Bitcast<double>(const_.f64_bits()));
       break;
 
     case Type::V128: {
diff --git a/test/wasm2c/tail-calls.txt b/test/wasm2c/tail-calls.txt
index e3b51bbe2..22eacd1a4 100644
--- a/test/wasm2c/tail-calls.txt
+++ b/test/wasm2c/tail-calls.txt
@@ -823,7 +823,7 @@ void w2c_test_tailcaller_0(w2c_test* instance) {
   u32 var_i0, var_i2;
   f32 var_f1;
   var_i0 = 1u;
-  var_f1 = f32_reinterpret_i32(0x40000000);
+  var_f1 = f32_reinterpret_i32(0x40000000 /* 2 */);
   var_i2 = 0u;
   static_assert(sizeof(struct wasm_multi_if) <= 1024);
   CHECK_CALL_INDIRECT(instance->w2c_tab, w2c_test_i32_f32, var_i2);
@@ -855,7 +855,7 @@ void wasm_tailcall_w2c_test_tailcaller_0(void **instance_ptr, void *tail_call_st
   u32 var_i0, var_i2;
   f32 var_f1;
   var_i0 = 1u;
-  var_f1 = f32_reinterpret_i32(0x40000000);
+  var_f1 = f32_reinterpret_i32(0x40000000 /* 2 */);
   var_i2 = 0u;
   static_assert(sizeof(struct wasm_multi_if) <= 1024);
   CHECK_CALL_INDIRECT(instance->w2c_tab, w2c_test_i32_f32, var_i2);