diff --git a/crates/swc_ecma_minifier/src/compress/pure/arrows.rs b/crates/swc_ecma_minifier/src/compress/pure/arrows.rs
index b1e1b9a7fd76..5b6f22b2e79d 100644
--- a/crates/swc_ecma_minifier/src/compress/pure/arrows.rs
+++ b/crates/swc_ecma_minifier/src/compress/pure/arrows.rs
@@ -21,7 +21,10 @@ impl Pure<'_> {
             function,
         }) = e
         {
-            if contains_this_expr(&function.body) || function.is_generator {
+            if function.params.iter().any(contains_this_expr)
+                || contains_this_expr(&function.body)
+                || function.is_generator
+            {
                 return;
             }
 
@@ -65,6 +68,7 @@ impl Pure<'_> {
             if m.function.is_generator
                 || contains_arguments(&m.function.body)
                 || contains_super(&m.function.body)
+                || m.function.params.iter().any(contains_this_expr)
             {
                 return;
             }
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/9186/1/input.js b/crates/swc_ecma_minifier/tests/fixture/issues/9186/1/input.js
new file mode 100644
index 000000000000..2e8405a3467a
--- /dev/null
+++ b/crates/swc_ecma_minifier/tests/fixture/issues/9186/1/input.js
@@ -0,0 +1,15 @@
+o = {
+    foo() {
+        return val;
+    },
+    s: "test",
+};
+console.log(o.foo().length);
+
+o = {
+    foo(val = this.s) {
+        return val;
+    },
+    s: "test",
+};
+console.log(o.foo().length);
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/9186/1/output.js b/crates/swc_ecma_minifier/tests/fixture/issues/9186/1/output.js
new file mode 100644
index 000000000000..2bd3a56f096a
--- /dev/null
+++ b/crates/swc_ecma_minifier/tests/fixture/issues/9186/1/output.js
@@ -0,0 +1,9 @@
+console.log((o = {
+    foo: ()=>val,
+    s: "test"
+}).foo().length), console.log((o = {
+    foo (val1 = this.s) {
+        return val1;
+    },
+    s: "test"
+}).foo().length);
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/9186/2/config.json b/crates/swc_ecma_minifier/tests/fixture/issues/9186/2/config.json
new file mode 100644
index 000000000000..a788b0827803
--- /dev/null
+++ b/crates/swc_ecma_minifier/tests/fixture/issues/9186/2/config.json
@@ -0,0 +1,6 @@
+{
+    "unsafe_arrows": true,
+    "ecma": 2015,
+    "evaluate": true,
+    "side_effects": true
+}
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/9186/2/input.js b/crates/swc_ecma_minifier/tests/fixture/issues/9186/2/input.js
new file mode 100644
index 000000000000..2902c52dbd81
--- /dev/null
+++ b/crates/swc_ecma_minifier/tests/fixture/issues/9186/2/input.js
@@ -0,0 +1,14 @@
+console.log(
+    (function () {
+        while (true) {
+            console.log(123);
+        }
+    })()
+);
+console.log(
+    (function (a = this.a) {
+        while (true) {
+            console.log(123);
+        }
+    })()
+);
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/9186/2/output.js b/crates/swc_ecma_minifier/tests/fixture/issues/9186/2/output.js
new file mode 100644
index 000000000000..11db4a03af0b
--- /dev/null
+++ b/crates/swc_ecma_minifier/tests/fixture/issues/9186/2/output.js
@@ -0,0 +1,10 @@
+console.log((()=>{
+    while(true){
+        console.log(123);
+    }
+})());
+console.log(function(a = this.a) {
+    while(true){
+        console.log(123);
+    }
+}());