1 files changed, 5 insertions, 1 deletions

diff --git a/src/CoverageListing.js b/src/CoverageListing.js
index 8b7830c..5c57907 100644
--- a/src/CoverageListing.js
+++ b/src/CoverageListing.js
@@ -51,7 +51,11 @@ export class CoverageListing extends Component {
   }
 
   _updateCoverageMap() {
-    const coverageMap = this.props.coverage.reduce((map, line) => (map[parseInt(line.$.nr)] = line.$, map), {});
+    const coverageMap = this.props.coverage.reduce(function(map, line) {
+      map[parseInt(line.$.nr)] = line.$;
+      return map;
+    }, {});
+
     this.setState({ coverageMap: coverageMap });
   }