diff --git a/lib/excellib.class.php b/lib/excellib.class.php
index 6950fbbdc44..5b2d8193d2a 100644
--- a/lib/excellib.class.php
+++ b/lib/excellib.class.php
@@ -425,11 +425,11 @@ class MoodleExcelWorksheet {
         $objdrawing->setOffsetX($x);
         $objdrawing->setOffsetY($y);
         $objdrawing->setWorksheet($this->worksheet);
-        if ($scale_x != 1) {
+        if ($scalex != 1) {
             $objdrawing->setResizeProportional(false);
             $objdrawing->getWidth($objdrawing->getWidth() * $scalex);
         }
-        if ($scale_y != 1) {
+        if ($scaley != 1) {
             $objdrawing->setResizeProportional(false);
             $objdrawing->setHeight($objdrawing->getHeight() * $scaley);
         }