diff --git a/lib/parse.js b/lib/parse.js
index 0a6072af..8e608e8a 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -1794,7 +1794,7 @@ function parse($TEXT, options) {
     var maybe_assign = function(no_in) {
         var start = S.token;
 
-        if (start.value == "(" && peek().value == ")") {
+        if (start.type == "punc" && start.value == "(" && peek().value == ")") {
             next();
             next();
             return arrow_function([]);
diff --git a/test/compress/issue-1001.js b/test/compress/issue-1001.js
new file mode 100644
index 00000000..89adf81c
--- /dev/null
+++ b/test/compress/issue-1001.js
@@ -0,0 +1,8 @@
+parenthesis_strings_in_parenthesis: {
+    input: {
+        ('(');
+        a(')');
+
+    }
+    expect_exact: '"(";a(")");'
+}