diff --git a/core/ui/PageTemplate/sidebar-resizer.tid b/core/ui/PageTemplate/sidebar-resizer.tid
index ceca2da6b..71e886ca6 100644
--- a/core/ui/PageTemplate/sidebar-resizer.tid
+++ b/core/ui/PageTemplate/sidebar-resizer.tid
@@ -8,6 +8,7 @@ code-body: yes
 \function resizer.state() [{$:/state/sidebar}]
 \function resizer.class() tc-main-sidebar-resizer
 \function set.throttling() yes
+\function drag.direction.reverse() [<get.theme.option sidebarposition>match[left]then[yes]] :else[[no]]
 \whitespace trim
 
 <%if [<get.theme.explicit.option sidebarresizer>match[show]] %>
diff --git a/core/wiki/macros/sidebar-resizer.tid b/core/wiki/macros/sidebar-resizer.tid
index 2892c1f19..7550a9cc9 100644
--- a/core/wiki/macros/sidebar-resizer.tid
+++ b/core/wiki/macros/sidebar-resizer.tid
@@ -326,7 +326,7 @@ title: $:/core/procedures/sidebar-resizer
 
 \function get.drag.diff()
 [<event-fromcatcher-posx>subtract<startPosX>]
-:map[<get.theme.option sidebarposition>match[left]then<currentTiddler>multiply[-1]else<currentTiddler>]
+:map[<drag.direction.reverse>match[yes]then<currentTiddler>multiply[-1]else<currentTiddler>]
 \end
 
 \procedure sidebar-resizer-pointermove-actions()
diff --git a/core/wiki/macros/sliders.tid b/core/wiki/macros/sliders.tid
index 141b0ee39..bc374a539 100644
--- a/core/wiki/macros/sliders.tid
+++ b/core/wiki/macros/sliders.tid
@@ -12,6 +12,7 @@ code-body: yes
 \function get.story-padding.right() 0px
 \function get.story-padding.left() 0px
 \function get.story.left() 0
+\function drag.direction.reverse() no
 \whitespace trim
 
 <$let
@@ -48,6 +49,7 @@ code-body: yes
 \function set.throttling() no
 \function get.left.minwidth() [<leftMinWidth>]
 \function get.right.minwidth() [<rightMinWidth>]
+\function drag.direction.reverse() no
 \whitespace trim
 
 <div