diff --git a/src/components/subtitlesettings/subtitleappearancehelper.js b/src/components/subtitlesettings/subtitleappearancehelper.js
index 4b8b7aed2a..904c018bfc 100644
--- a/src/components/subtitlesettings/subtitleappearancehelper.js
+++ b/src/components/subtitlesettings/subtitleappearancehelper.js
@@ -89,7 +89,7 @@ function getTextStyles(settings, preview) {
     }
 
     if (!preview) {
-        const pos = parseInt(settings.verticalPosition);
+        const pos = parseInt(settings.verticalPosition, 10);
         const lineHeight = 1.35; // FIXME: It is better to read this value from element
         const line = Math.abs(pos * lineHeight);
         if (pos < 0) {
@@ -108,7 +108,7 @@ function getWindowStyles(settings, preview) {
     const list = [];
 
     if (!preview) {
-        const pos = parseInt(settings.verticalPosition);
+        const pos = parseInt(settings.verticalPosition, 10);
         if (pos < 0) {
             list.push({ name: 'top', value: '' });
             list.push({ name: 'bottom', value: '0' });
diff --git a/src/plugins/htmlVideoPlayer/plugin.js b/src/plugins/htmlVideoPlayer/plugin.js
index 77e3253641..7ef35adf41 100644
--- a/src/plugins/htmlVideoPlayer/plugin.js
+++ b/src/plugins/htmlVideoPlayer/plugin.js
@@ -1200,7 +1200,7 @@ function tryRemoveElement(elem) {
                     console.debug(`downloaded ${data.TrackEvents.length} track events`);
 
                     const subtitleAppearance = userSettings.getSubtitleAppearanceSettings();
-                    const cueLine = parseInt(subtitleAppearance.verticalPosition);
+                    const cueLine = parseInt(subtitleAppearance.verticalPosition, 10);
 
                     // add some cues to show the text
                     // in safari, the cues need to be added before setting the track mode to showing