diff --git a/src/calibre/gui2/library/alternate_views.py b/src/calibre/gui2/library/alternate_views.py
index 63e6ee631e..95edb3f90c 100644
--- a/src/calibre/gui2/library/alternate_views.py
+++ b/src/calibre/gui2/library/alternate_views.py
@@ -345,7 +345,7 @@ class CoverDelegate(QStyledItemDelegate):
 
     def calculate_spacing(self):
         spc = self.original_spacing = gprefs['cover_grid_spacing']
-        if spc < 0.1:
+        if spc < 0.01:
             self.spacing = max(10, min(50, int(0.1 * self.original_width)))
         else:
             self.spacing = self.parent().logicalDpiX() * CM_TO_INCH * spc
diff --git a/src/calibre/gui2/preferences/look_feel.ui b/src/calibre/gui2/preferences/look_feel.ui
index 71bb3c82db..1adda76634 100644
--- a/src/calibre/gui2/preferences/look_feel.ui
+++ b/src/calibre/gui2/preferences/look_feel.ui
@@ -289,7 +289,10 @@
             <string> cm</string>
            </property>
            <property name="decimals">
-            <number>1</number>
+            <number>2</number>
+           </property>
+           <property name="singleStep">
+            <double>0.100000000000000</double>
            </property>
           </widget>
          </item>