diff --git a/RELEASE.md b/RELEASE.md
index 1f2fbb2b..dbd61386 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,3 +1,7 @@
+# 5.0.2
+
+- Ensures paths being passed to Roslyn in Buildalyzer.Workspaces are absolute (#232, thanks @tjchester).
+
 # 5.0.1
 
 - Added support for additional files on `GetWorkspace()` (#231, thanks @Corniel).
diff --git a/src/Buildalyzer.Workspaces/AnalyzerResultExtensions.cs b/src/Buildalyzer.Workspaces/AnalyzerResultExtensions.cs
index 63682e24..0d6d532f 100644
--- a/src/Buildalyzer.Workspaces/AnalyzerResultExtensions.cs
+++ b/src/Buildalyzer.Workspaces/AnalyzerResultExtensions.cs
@@ -287,7 +287,7 @@ private static IEnumerable<DocumentInfo> GetAdditionalDocuments(IAnalyzerResult
         {
             string projectDirectory = Path.GetDirectoryName(analyzerResult.ProjectFilePath);
             string[] additionalFiles = analyzerResult.AdditionalFiles ?? Array.Empty<string>();
-            return GetDocuments(additionalFiles.Select(x => Path.Combine(projectDirectory, x)), projectId);
+            return GetDocuments(additionalFiles.Select(x => Path.Combine(projectDirectory!, x)), projectId);
         }
 
         private static IEnumerable<MetadataReference> GetMetadataReferences(IAnalyzerResult analyzerResult) =>
@@ -300,8 +300,9 @@ private static IEnumerable<AnalyzerReference> GetAnalyzerReferences(IAnalyzerRes
         {
             IAnalyzerAssemblyLoader loader = workspace.Services.GetRequiredService<IAnalyzerService>().GetLoader();
 
-            return analyzerResult.AnalyzerReferences?.Where(x => File.Exists(Path.GetFullPath(x)))
-                .Select(x => new AnalyzerFileReference(Path.GetFullPath(x), loader))
+            string projectDirectory = Path.GetDirectoryName(analyzerResult.ProjectFilePath);
+            return analyzerResult.AnalyzerReferences?.Where(x => File.Exists(Path.GetFullPath(x, projectDirectory!)))
+                .Select(x => new AnalyzerFileReference(Path.GetFullPath(x, projectDirectory!), loader))
                 ?? (IEnumerable<AnalyzerReference>)Array.Empty<AnalyzerReference>();
         }