diff --git a/docs/version_changes.md b/docs/version_changes.md
index ceedb005b3..6bd2a65f4c 100644
--- a/docs/version_changes.md
+++ b/docs/version_changes.md
@@ -1,5 +1,11 @@
 FloPy Changes
 -----------------------------------------------
+### Version 3.2.13
+
+* Bug fixes:
+
+    * Fixed instantiation of IUZBND in UZT class. When no array was supplied in argument list for IUZBND, default of a 3D array was used, needs to be 2D (#605)
+
 ### Version 3.2.12
 
 * Added a check method for OC package (#558)
diff --git a/flopy/mt3d/mtuzt.py b/flopy/mt3d/mtuzt.py
index deef15b027..c2ff815fed 100644
--- a/flopy/mt3d/mtuzt.py
+++ b/flopy/mt3d/mtuzt.py
@@ -190,8 +190,8 @@ def __init__(self, model, icbcuz=None, iet=0, iuzfbnd=None,
                                   locat=self.unit_number[0])
         # set iuzfbnd based on UZF input file
         else:
-            arr = np.zeros((nlay, nrow, ncol), dtype=np.int32)
-            self.iuzfbnd = Util3d(self.parent, (nlay, nrow, ncol), np.int32,
+            arr = np.zeros((nrow, ncol), dtype=np.int32)
+            self.iuzfbnd = Util2d(self.parent, (nrow, ncol), np.int32,
                                   arr, name='iuzfbnd',
                                   locat=self.unit_number[0])