diff --git a/Regression/WarpX-tests.ini b/Regression/WarpX-tests.ini
index 3d1dbfe3b0f..771d7c4921c 100644
--- a/Regression/WarpX-tests.ini
+++ b/Regression/WarpX-tests.ini
@@ -1509,7 +1509,7 @@ analysisOutputImage = langmuir_multi_2d_analysis.png
 
 [Langmuir_multi_nodal]
 buildDir = .
-inputFile =
+inputFile = Examples/Tests/langmuir/inputs_3d
 runtime_params = warpx.grid_type=collocated algo.current_deposition=direct
 dim = 3
 addToCompileString =