diff --git a/Nibriboard/ClientFiles/BoardWindow.js b/Nibriboard/ClientFiles/BoardWindow.js
index 4d8ba2d..becf37f 100644
--- a/Nibriboard/ClientFiles/BoardWindow.js
+++ b/Nibriboard/ClientFiles/BoardWindow.js
@@ -314,8 +314,8 @@ class BoardWindow extends EventEmitter
 		// Store the viewport information for later
 		this.viewportState = event;
 		
-		this.viewport.x += event.dx * 1/this.viewport.zoomLevel;
-		this.viewport.y += event.dy * 1/this.viewport.zoomLevel;
+		this.viewport.x -= event.dx * 1/this.viewport.zoomLevel;
+		this.viewport.y -= event.dy * 1/this.viewport.zoomLevel;
 		this.viewport.zoomLevel += event.dz / 1000;
 		console.debug(`Viewport now at (${this.viewport.x}, ${this.viewport.y}) @ ${this.viewport.zoomLevel}x zoom`);
 	}