diff --git a/lib/compress.js b/lib/compress.js
index c9ca15ebf5..3e5e9194b7 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -13454,8 +13454,11 @@ Compressor.prototype.compress = function(node) {
                 inlined = inlined.try_inline(compressor, scope, true, in_loop);
                 if (inlined) {
                     this.init = null;
-                    inlined.body.push(this);
-                    return inlined;
+                    if (inlined instanceof AST_BlockStatement) {
+                        inlined.body.push(this);
+                        return inlined;
+                    }
+                    return make_node(AST_BlockStatement, inlined, { body: [ inlined, this ] });
                 }
             }
             return body && this;
diff --git a/test/compress/functions.js b/test/compress/functions.js
index 75131fcdcb..5204df6690 100644
--- a/test/compress/functions.js
+++ b/test/compress/functions.js
@@ -8207,3 +8207,24 @@ issue_5332_2: {
     }
     expect_stdout: "NaN"
 }
+
+issue_5366: {
+    options = {
+        inline: true,
+    }
+    input: {
+        for (console.log("foo") || function() {
+            while (console.log("bar"));
+        }(); console.log("baz") ;);
+    }
+    expect: {
+        if (!console.log("foo"))
+            while (console.log("bar"));
+        for (;console.log("baz"););
+    }
+    expect_stdout: [
+        "foo",
+        "bar",
+        "baz",
+    ]
+}