diff --git a/src/ProjGraph.Lib.Core/Parsers/SlnParser.cs b/src/ProjGraph.Lib.Core/Parsers/SlnParser.cs
index fd1d2ed..4aeed5b 100644
--- a/src/ProjGraph.Lib.Core/Parsers/SlnParser.cs
+++ b/src/ProjGraph.Lib.Core/Parsers/SlnParser.cs
@@ -24,7 +24,8 @@ public IEnumerable<string> GetProjectPaths(string path)
             return [];
         }
 
-        var slnFile = SolutionFile.Parse(path);
+        var fullPath = fileSystem.GetFullPath(path);
+        var slnFile = SolutionFile.Parse(fullPath);
 
         return slnFile.ProjectsInOrder
             .Where(p => p.ProjectType == SolutionProjectType.KnownToBeMSBuildFormat)