diff --git a/stimupy/utils/export.py b/stimupy/utils/export.py
index dc405524..524775ed 100644
--- a/stimupy/utils/export.py
+++ b/stimupy/utils/export.py
@@ -8,7 +8,7 @@
 def arrs_to_checksum(stim, keys=["img", "mask"]):
     # Hash (md5) values, and save only the hex
     for key in keys:
-        stim[key] = md5(np.ascontiguousarray(stim[key])).hexdigest()
+        stim[key] = md5(np.ascontiguousarray(stim[key].round(8))).hexdigest()
 
     return stim