diff --git a/src/pyj/read_book/prefs/fonts.pyj b/src/pyj/read_book/prefs/fonts.pyj
index 31e3446ffe..bee7d3978c 100644
--- a/src/pyj/read_book/prefs/fonts.pyj
+++ b/src/pyj/read_book/prefs/fonts.pyj
@@ -9,6 +9,7 @@ from book_list.globals import get_session_data
 from dom import unique_id
 from read_book.globals import runtime
 from read_book.prefs.utils import create_button_box
+from read_book.prefs.font_size import MAX_FONT_SIZE, MIN_FONT_SIZE
 
 CONTAINER = unique_id('standalone-font-settings')
 DEFAULT_STANDARD_FONT = 'serif'
@@ -46,7 +47,7 @@ def standard_font(settings):
 
 
 def minimum_font_size(settings):
-    ans = E.input(max='100', min='0', step='1', type='number', name='minimum_font_size')
+    ans = E.input(max=str(MAX_FONT_SIZE), min=str(MIN_FONT_SIZE), step='1', type='number', name='minimum_font_size')
     if jstype(settings.minimum_font_size) is 'number':
         ans.value = settings.minimum_font_size + ''
     else:
@@ -55,7 +56,7 @@ def minimum_font_size(settings):
 
 
 def zoom_step_size(settings):
-    ans = E.input(max='100', min='1', step='1', type='number', name='zoom_step_size')
+    ans = E.input(max='100', min='10', step='1', type='number', name='zoom_step_size')
     if jstype(settings.zoom_step_size) is 'number':
         ans.value = settings.zoom_step_size + ''
     else: