diff --git a/src/Core/Internal/Filtering.cs b/src/Core/Internal/Filtering.cs
index dfa1405..eade7fa 100644
--- a/src/Core/Internal/Filtering.cs
+++ b/src/Core/Internal/Filtering.cs
@@ -15,8 +15,10 @@ public static bool ShouldMutateProject(Project project, Config config)
                 return true;
             }
 
+            var relativePath = RelativeFilePath(project.FilePath, config);
+
             return config.ProjectFilters
-                .Any(f => Glob.Parse(f).IsMatch(project.Name));
+                .Any(f => Glob.Parse(f).IsMatch(project.Name) || Glob.Parse(f).IsMatch(relativePath));
         }
 
         public static bool ShouldMutateDocument(Document document, Config config)
@@ -33,7 +35,7 @@ private static bool ShouldMutateAccordingToFilters(Document document, Config con
                 return true;
             }
 
-            var relativePath = RelativeDocumentPath(document, config);
+            var relativePath = RelativeFilePath(document.FilePath, config);
 
             var matchesAnyFilter = config.SourceFileFilters
                 .Any(f => Glob.Parse(f).IsMatch(relativePath));
@@ -48,16 +50,16 @@ private static bool ShouldMutateAccordingToLocallyModifiedList(Document document
                 return true;
             }
 
-            var relativePath = RelativeDocumentPath(document, config);
+            var relativePath = RelativeFilePath(document.FilePath, config);
 
             return config.LocallyModifiedSourceFiles
                 .Any(f => string.Equals(f, relativePath, StringComparison.InvariantCultureIgnoreCase));
         }
 
-        private static string RelativeDocumentPath(Document document, Config config)
+        private static string RelativeFilePath(string filePath, Config config)
         {
 	        var baseDir = config.GetSolutionFolder();
-            var relativePath = document.FilePath.Substring(baseDir.Length + 1);
+            var relativePath = filePath.Substring(baseDir.Length + 1);
             return relativePath;
         }
     }
diff --git a/src/Tests/Core/Filtering/Projects_are_filtered.cs b/src/Tests/Core/Filtering/Projects_are_filtered.cs
index 2fafe8c..4f16723 100644
--- a/src/Tests/Core/Filtering/Projects_are_filtered.cs
+++ b/src/Tests/Core/Filtering/Projects_are_filtered.cs
@@ -3,14 +3,16 @@
 
 namespace Fettle.Tests.Core.Filtering
 {
+    [TestFixture("HasSurvivingMutants.MoreImplementation")]
+    [TestFixture(@"MoreImplementation\HasSurvivingMutants.MoreImplementation.csproj")]
     class Projects_are_filtered : Contexts.Default
     {
-        public Projects_are_filtered()
+        public Projects_are_filtered(string projectFilter)
         {
             Given_a_partially_tested_app_in_which_a_mutant_will_survive();
             Given_source_file_filters(null);
 
-            Given_project_filters("HasSurvivingMutants.MoreImplementation");
+            Given_project_filters(projectFilter);
 
             When_mutation_testing_the_app();
         }