diff --git a/crates/openlogi-desktop/src/features/mouse/geometry.rs b/crates/openlogi-desktop/src/features/mouse/geometry.rs
index 9cb6cbc57..3f073d918 100644
--- a/crates/openlogi-desktop/src/features/mouse/geometry.rs
+++ b/crates/openlogi-desktop/src/features/mouse/geometry.rs
@@ -230,9 +230,11 @@ fn map_slot_name(name: &str) -> Option<MouseControlId> {
         }
         "SLOT_NAME_BACK_BUTTON" => Some(MouseControlId::Button(ButtonId::Back)),
         "SLOT_NAME_FORWARD_BUTTON" => Some(MouseControlId::Button(ButtonId::Forward)),
-        "SLOT_NAME_MODESHIFT_BUTTON" | "SLOT_NAME_DPI_BUTTON" => {
-            Some(MouseControlId::Button(ButtonId::DpiToggle))
-        }
+        // MX Ergo names its precision-mode/DPI-shift button after its
+        // Options+ function rather than "DPI" or "ModeShift".
+        "SLOT_NAME_MODESHIFT_BUTTON"
+        | "SLOT_NAME_DPI_BUTTON"
+        | "SLOT_NAME_CHANGE_POINTER_SPEED" => Some(MouseControlId::Button(ButtonId::DpiToggle)),
         "SLOT_NAME_THUMBWHEEL" => Some(MouseControlId::ThumbwheelRotation),
         "SLOT_NAME_GESTURE_BUTTON" => Some(MouseControlId::Button(ButtonId::GestureButton)),
         // The MX Master 4 Haptic Sense Panel. Logi names the slot after its
@@ -282,6 +284,11 @@ mod tests {
             map_slot_name("SLOT_NAME_DPI_BUTTON"),
             Some(MouseControlId::Button(ButtonId::DpiToggle))
         );
+        // MX Ergo's precision-mode/DPI-shift button uses this slot name.
+        assert_eq!(
+            map_slot_name("SLOT_NAME_CHANGE_POINTER_SPEED"),
+            Some(MouseControlId::Button(ButtonId::DpiToggle))
+        );
     }
 
     #[test]