diff --git a/simgear/scene/material/makeEffect.cxx b/simgear/scene/material/makeEffect.cxx
index 9855f371..b0ead006 100644
--- a/simgear/scene/material/makeEffect.cxx
+++ b/simgear/scene/material/makeEffect.cxx
@@ -116,7 +116,7 @@ Effect* makeEffect(const string& name,
     }
     string effectFileName(name);
     effectFileName += ".eff";
-    string absFileName = SGModelLib::findDataFile(effectFileName, options, modelPath);
+    string absFileName = SGModelLib::findDataFile(effectFileName, options, modelPath.dir());
     if (absFileName.empty()) {
         simgear::reportFailure(simgear::LoadFailure::NotFound, simgear::ErrorCode::LoadEffectsShaders, "Couldn't find Effect:" + effectFileName);
         return nullptr;
diff --git a/simgear/scene/model/SGReaderWriterXML.cxx b/simgear/scene/model/SGReaderWriterXML.cxx
index 55de8b19..af1e6f7b 100644
--- a/simgear/scene/model/SGReaderWriterXML.cxx
+++ b/simgear/scene/model/SGReaderWriterXML.cxx
@@ -801,7 +801,7 @@ sgLoad3DModel_internal(const SGPath& path,
     makeEffectAnimations(animation_nodes, effect_nodes);
     {
         ref_ptr<Node> modelWithEffects = instantiateEffects(group.get(), effect_nodes, options.get(),
-                                                            path.dirPath());
+                                                            path);
         group = static_cast<Group*>(modelWithEffects.get());
     }