diff --git a/pyrevitlib/pyrevit/forms/__init__.py b/pyrevitlib/pyrevit/forms/__init__.py
index f955af8ee..9d73c96e5 100644
--- a/pyrevitlib/pyrevit/forms/__init__.py
+++ b/pyrevitlib/pyrevit/forms/__init__.py
@@ -805,6 +805,8 @@ class SelectFromList(TemplateUserInputWindow):
 
     """
 
+    in_check = False
+    in_uncheck = False
     xaml_source = 'SelectFromList.xaml'
 
     @property
@@ -1014,11 +1016,21 @@ def uncheck_all(self, sender, args):    #pylint: disable=W0613
 
     def check_selected(self, sender, args):    #pylint: disable=W0613
         """Mark selected checkboxes as checked."""
-        self._set_states(state=True, selected=True)
+        if not self.in_check:
+            try:
+                self.in_check = True
+                self._set_states(state=True, selected=True)
+            finally:
+                self.in_check = False
 
     def uncheck_selected(self, sender, args):    #pylint: disable=W0613
         """Mark selected checkboxes as unchecked."""
-        self._set_states(state=False, selected=True)
+        if not self.in_uncheck:
+            try:
+                self.in_uncheck = True
+                self._set_states(state=False, selected=True)
+            finally:
+                self.in_uncheck = False
 
     def button_reset(self, sender, args):#pylint: disable=W0613
         if self.reset_func: