diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/8161/input.js b/crates/swc_ecma_minifier/tests/fixture/issues/8161/input.js
new file mode 100644
index 000000000000..7845f4b9cfe8
--- /dev/null
+++ b/crates/swc_ecma_minifier/tests/fixture/issues/8161/input.js
@@ -0,0 +1,10 @@
+function run(flag, output = 'a output') {
+    if (flag === 'b') {
+        output = 'b output'
+    }
+
+    console.log(output)
+}
+
+run('a')
+run('b')
\ No newline at end of file
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/8161/output.js b/crates/swc_ecma_minifier/tests/fixture/issues/8161/output.js
new file mode 100644
index 000000000000..3b0688e309c7
--- /dev/null
+++ b/crates/swc_ecma_minifier/tests/fixture/issues/8161/output.js
@@ -0,0 +1,4 @@
+function run(flag, output = 'a output') {
+    'b' === flag && (output = 'b output'), console.log(output);
+}
+run('a'), run('b');
diff --git a/crates/swc_ecma_usage_analyzer/src/analyzer/mod.rs b/crates/swc_ecma_usage_analyzer/src/analyzer/mod.rs
index 8a95c89c625a..f0eda0e13330 100644
--- a/crates/swc_ecma_usage_analyzer/src/analyzer/mod.rs
+++ b/crates/swc_ecma_usage_analyzer/src/analyzer/mod.rs
@@ -277,6 +277,12 @@ where
             };
             p.right.visit_with(&mut *self.with_ctx(ctx))
         }
+
+        let ids = find_pat_ids(&p.left);
+
+        for id in ids {
+            self.report_usage(&id, true);
+        }
     }
 
     #[cfg_attr(feature = "debug", tracing::instrument(skip_all))]