diff --git a/src/apis/emscripten/mod.rs b/src/apis/emscripten/mod.rs
index 05d5e952c..062edbf51 100644
--- a/src/apis/emscripten/mod.rs
+++ b/src/apis/emscripten/mod.rs
@@ -58,7 +58,7 @@ pub fn emscripten_set_up_memory(memory: &mut LinearMemory) {
 macro_rules! mock_external {
     ($import:ident, $name:ident) => {{
         fn _mocked_fn() {
-            println!("emscripten::{} <mock>", stringify!($name));
+            debug!("emscripten::{} <mock>", stringify!($name));
             // return 0
         }
         $import.set(