diff --git a/hydrolib/core/dflowfm/research/models.py b/hydrolib/core/dflowfm/research/models.py
index 43bc654d3..8d344bf40 100644
--- a/hydrolib/core/dflowfm/research/models.py
+++ b/hydrolib/core/dflowfm/research/models.py
@@ -917,7 +917,7 @@ class ResearchFMModel(FMModel):
     physics: ResearchPhysics = Field(default_factory=ResearchPhysics)
     sediment: ResearchSediment = Field(default_factory=ResearchSediment)
     wind: ResearchWind = Field(default_factory=ResearchWind)
-    waves: Optional[ResearchWaves] = Field(default_factory=ResearchWaves)
+    waves: Optional[ResearchWaves] = Field(None)
     time: ResearchTime = Field(default_factory=ResearchTime)
     restart: ResearchRestart = Field(default_factory=ResearchRestart)
     trachytopes: ResearchTrachytopes = Field(default_factory=ResearchTrachytopes)
diff --git a/tests/dflowfm/test_research.py b/tests/dflowfm/test_research.py
index 0a2f8c9b0..10c626f89 100644
--- a/tests/dflowfm/test_research.py
+++ b/tests/dflowfm/test_research.py
@@ -13,7 +13,6 @@
     ResearchSedtrails,
     ResearchTime,
     ResearchTrachytopes,
-    ResearchWaves,
     ResearchWind,
 )
 from tests.utils import test_input_dir
@@ -29,7 +28,6 @@ def test_create_research_fmmodel(self):
         assert isinstance(model.physics, ResearchPhysics)
         assert isinstance(model.sediment, ResearchSediment)
         assert isinstance(model.wind, ResearchWind)
-        assert isinstance(model.waves, ResearchWaves)
         assert isinstance(model.time, ResearchTime)
         assert isinstance(model.trachytopes, ResearchTrachytopes)
         assert isinstance(model.output, ResearchOutput)