diff --git a/src/coverlet.core/Reporters/CoberturaReporter.cs b/src/coverlet.core/Reporters/CoberturaReporter.cs
index 9204850..fce3643 100644
--- a/src/coverlet.core/Reporters/CoberturaReporter.cs
+++ b/src/coverlet.core/Reporters/CoberturaReporter.cs
@@ -12,7 +12,7 @@ namespace Coverlet.Core.Reporters
     {
         public string Format => "cobertura";
 
-        public string Extension => "xml";
+        public string Extension => "cobertura.xml";
 
         public string Report(CoverageResult result)
         {
diff --git a/src/coverlet.core/Reporters/OpenCoverReporter.cs b/src/coverlet.core/Reporters/OpenCoverReporter.cs
index cb2b60d..9865396 100644
--- a/src/coverlet.core/Reporters/OpenCoverReporter.cs
+++ b/src/coverlet.core/Reporters/OpenCoverReporter.cs
@@ -11,7 +11,7 @@ namespace Coverlet.Core.Reporters
     {
         public string Format => "opencover";
 
-        public string Extension => "xml";
+        public string Extension => "opencover.xml";
 
         public string Report(CoverageResult result)
         {