diff --git a/tests/test_viz.py b/tests/test_viz.py
index 58de06b..1d0b0c2 100644
--- a/tests/test_viz.py
+++ b/tests/test_viz.py
@@ -8,7 +8,7 @@ def test_muap_dict():
     Run unit test on muap_dict function from EMGdecomPy.
     """
     # load data
-    gl_10 = loadmat("../data/raw/gl_10.mat")
+    gl_10 = loadmat("../data/raw/GL_10.mat")
     raw = gl_10["SIG"]
 
     # ptl