diff --git a/index.js b/index.js
index 7d121178f..36bd06cfc 100755
--- a/index.js
+++ b/index.js
@@ -369,7 +369,7 @@ class NYC {
         }
       }, this)
     } else {
-      coverage = this.sourceMaps.remapCoverage(coverage)
+      this.sourceMaps.addSourceMaps(coverage)
     }
 
     var id = this.processInfo.uuid
diff --git a/lib/source-maps.js b/lib/source-maps.js
index d62072548..e77981c95 100644
--- a/lib/source-maps.js
+++ b/lib/source-maps.js
@@ -37,6 +37,10 @@ class SourceMaps {
     return sourceMap
   }
 
+  addSourceMaps (coverage) {
+    this._sourceMapCache.addInputSourceMapsSync(coverage)
+  }
+
   remapCoverage (obj) {
     const transformed = this._sourceMapCache.transformCoverage(
       libCoverage.createCoverageMap(obj)