diff --git a/src/clean-ast.js b/src/clean-ast.js
index 6df8a6109..6224409c1 100644
--- a/src/clean-ast.js
+++ b/src/clean-ast.js
@@ -61,6 +61,10 @@ function massageAST(ast) {
       delete newObj.value;
     }
 
+    if (ast.type === "css-rule") {
+      delete newObj.params;
+    }
+
     // We convert <div></div> to <div />
     if (ast.type === "JSXOpeningElement") {
       delete newObj.selfClosing;
diff --git a/tests/css_params/__snapshots__/jsfmt.spec.js.snap b/tests/css_params/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 000000000..96928cb6f
--- /dev/null
+++ b/tests/css_params/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,13 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`params.css 1`] = `
+.clusterPlannerDialog input[type="text"],
+.clusterPlannerDialog .uiTypeahead {
+  width: 220px;
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.clusterPlannerDialog input[type="text"], .clusterPlannerDialog .uiTypeahead {
+  width: 220px;
+}
+
+`;
diff --git a/tests/css_params/jsfmt.spec.js b/tests/css_params/jsfmt.spec.js
new file mode 100644
index 000000000..a7d303b6c
--- /dev/null
+++ b/tests/css_params/jsfmt.spec.js
@@ -0,0 +1 @@
+run_spec(__dirname, { parser: "postcss" });
diff --git a/tests/css_params/params.css b/tests/css_params/params.css
new file mode 100644
index 000000000..22a4ee345
--- /dev/null
+++ b/tests/css_params/params.css
@@ -0,0 +1,4 @@
+.clusterPlannerDialog input[type="text"],
+.clusterPlannerDialog .uiTypeahead {
+  width: 220px;
+}