diff --git a/src/Ocelot/Configuration/Validator/FileConfigurationFluentValidator.cs b/src/Ocelot/Configuration/Validator/FileConfigurationFluentValidator.cs
index 3b1588d2..728c218f 100644
--- a/src/Ocelot/Configuration/Validator/FileConfigurationFluentValidator.cs
+++ b/src/Ocelot/Configuration/Validator/FileConfigurationFluentValidator.cs
@@ -122,7 +122,7 @@
         {
             var matchingReRoutes = reRoutes
                 .Where(r => r.UpstreamPathTemplate == reRoute.UpstreamPathTemplate
-                            && (r.UpstreamHost != reRoute.UpstreamHost || reRoute.UpstreamHost == null))
+                            && (r.UpstreamHost == reRoute.UpstreamHost || reRoute.UpstreamHost == null))
                 .ToList();
 
             if (matchingReRoutes.Count == 1)
diff --git a/test/Ocelot.UnitTests/Configuration/Validation/FileConfigurationFluentValidatorTests.cs b/test/Ocelot.UnitTests/Configuration/Validation/FileConfigurationFluentValidatorTests.cs
index c7ffbb05..a77d7c60 100644
--- a/test/Ocelot.UnitTests/Configuration/Validation/FileConfigurationFluentValidatorTests.cs
+++ b/test/Ocelot.UnitTests/Configuration/Validation/FileConfigurationFluentValidatorTests.cs
@@ -1023,7 +1023,7 @@
                                     Host = "bb.co.uk"
                                 }
                             },
-                            UpstreamHost = "host1"
+                            UpstreamHost = "host2"
                         }
                     }
             }))