diff --git a/.travis.yml b/.travis.yml
index 8f2f724..a5d3b4e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,6 +27,7 @@ jobs:
       node_js:
         - "8"
         - "10"
+        - "12"
       script:
         - yarn test
     - stage: release
diff --git a/lib/getManifest.js b/lib/getManifest.js
index adfbbf7..4d72cfb 100644
--- a/lib/getManifest.js
+++ b/lib/getManifest.js
@@ -17,7 +17,7 @@ function getManifest(path) {
 	let stat;
 	try {
 		stat = lstatSync(path);
-	} catch {
+	} catch (_) {
 		// istanbul ignore next (hard to test — happens if no read acccess etc).
 		throw new ReferenceError(`package.json cannot be read: "${path}"`);
 	}
@@ -29,7 +29,7 @@ function getManifest(path) {
 	let contents;
 	try {
 		contents = readFileSync(path, "utf8");
-	} catch {
+	} catch (_) {
 		// istanbul ignore next (hard to test — happens if no read access etc).
 		throw new ReferenceError(`package.json cannot be read: "${path}"`);
 	}
@@ -38,7 +38,7 @@ function getManifest(path) {
 	let manifest;
 	try {
 		manifest = JSON.parse(contents);
-	} catch {
+	} catch (_) {
 		throw new SyntaxError(`package.json could not be parsed: "${path}"`);
 	}