diff --git a/src/simpleLightbox.js b/src/simpleLightbox.js
index cf0b88f..b5d1dac 100644
--- a/src/simpleLightbox.js
+++ b/src/simpleLightbox.js
@@ -338,8 +338,8 @@
                                     '<button type="button" title="' + o.closeBtnCaption + '" class="slbCloseBtn ' + o.closeBtnClass + '">×</button>' +
                                     (this.items.length > 1
                                         ? '<div class="slbArrows">' +
-                                             '<button type="button" title="' + o.prevBtnCaption + '" class="prev slbArrow' + o.prevBtnClass + '">' + o.prevBtnCaption + '</button>' +
-                                             '<button type="button" title="' + o.nextBtnCaption + '" class="next slbArrow' + o.nextBtnClass + '">' + o.nextBtnCaption + '</button>' +
+                                             '<button type="button" title="' + o.prevBtnCaption + '" class="prev slbArrow ' + o.prevBtnClass + '">' + o.prevBtnCaption + '</button>' +
+                                             '<button type="button" title="' + o.nextBtnCaption + '" class="next slbArrow ' + o.nextBtnClass + '">' + o.nextBtnCaption + '</button>' +
                                           '</div>'
                                         : ''
                                     ) +