diff --git a/src/js/bootstrap-slider.js b/src/js/bootstrap-slider.js
index 1292a445..d29ded72 100644
--- a/src/js/bootstrap-slider.js
+++ b/src/js/bootstrap-slider.js
@@ -1193,6 +1193,7 @@ const windowIsDefined = (typeof window === "object");
 			},
 			_layout: function() {
 				var positionPercentages;
+				var formattedValue;
 
 				if(this.options.reversed) {
 					positionPercentages = [ 100 - this._state.percentage[0], this.options.range ? 100 - this._state.percentage[1] : this._state.percentage[1]];
@@ -1203,14 +1204,22 @@ const windowIsDefined = (typeof window === "object");
 
 				this.handle1.style[this.stylePos] = `${positionPercentages[0]}%`;
 				this.handle1.setAttribute('aria-valuenow', this._state.value[0]);
-				if (isNaN(this.options.formatter(this._state.value[0])) ) {
-					this.handle1.setAttribute('aria-valuetext', this.options.formatter(this._state.value[0]));
+				formattedValue = this.options.formatter(this._state.value[0]);
+				if (isNaN(formattedValue)) {
+					this.handle1.setAttribute('aria-valuetext', formattedValue);
+				}
+				else {
+					this.handle1.removeAttribute('aria-valuetext');
 				}
 
 				this.handle2.style[this.stylePos] =`${positionPercentages[1]}%`;
 				this.handle2.setAttribute('aria-valuenow', this._state.value[1]);
-				if (isNaN(this.options.formatter(this._state.value[1])) ) {
-					this.handle2.setAttribute('aria-valuetext', this.options.formatter(this._state.value[1]));
+				formattedValue = this.options.formatter(this._state.value[1]);
+				if (isNaN(formattedValue)) {
+					this.handle2.setAttribute('aria-valuetext', formattedValue);
+				}
+				else {
+					this.handle2.removeAttribute('aria-valuetext');
 				}
 
 				/* Position highlight range elements */
diff --git a/test/specs/AriaValueTextFormatterSpec.js b/test/specs/AriaValueTextFormatterSpec.js
index e5543b09..8189c6bf 100644
--- a/test/specs/AriaValueTextFormatterSpec.js
+++ b/test/specs/AriaValueTextFormatterSpec.js
@@ -53,5 +53,59 @@ describe("Aria-valuetext Tests", function() {
       var ttmaxMessage = $("#accessibilitySliderC").prev(".slider").children(".max-slider-handle").attr("aria-valuetext");
       expect(ttminMessage).toBe(expectedMessageC[0]);
       expect(ttmaxMessage).toBe(expectedMessageC[1]);
+
+      $('#accessibilitySliderC').slider('destroy');
+    });
+
+    describe("Unset 'aria-valuetext' attribute when value can be represented as a number", function() {
+      var $testSliderC;
+      var dayOfWeek;
+
+      var dayFormatter = function(value) {
+        if (value[1]) {
+          return [ dayOfWeek[value[0]-1], dayOfWeek[value[1]-1] ];
+        }
+        return dayOfWeek[value-1];
+      };
+
+      beforeEach(function() {
+        dayOfWeek = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'];
+
+        $testSliderC = $('#accessibilitySliderC').slider({
+          id: 'testAccessbilitySlider',
+          min: 1,
+          max: 7,
+          formatter : dayFormatter
+        });
+      });
+
+      afterEach(function() {
+        if ($testSliderC) {
+          $testSliderC.slider('destroy');
+        }
+      });
+
+      it("Should unset 'aria-valuetext' attribute", function() {
+        dayOfWeek[0] = '1';
+
+        var valueToSet = 1;
+        $testSliderC.slider('setValue', valueToSet);
+        var ariaValueText = $('#testAccessbilitySlider').find('.min-slider-handle')[0].getAttribute('aria-valuetext');
+        expect(ariaValueText).toBeNull();
+      });
+
+      it("Should unset 'aria-valuetext' attributes for range sliders", function() {
+        dayOfWeek[0] = '1';
+        dayOfWeek[6] = '7';
+        $testSliderC.slider('setAttribute', 'range', true);
+        $testSliderC.slider('refresh');
+
+        var valuesToSet = [1, 7];
+        $testSliderC.slider('setValue', valuesToSet);
+        var ariaValueText1 = $('#testAccessbilitySlider').find('.min-slider-handle')[0].getAttribute('aria-valuetext');
+        var ariaValueText2 = $('#testAccessbilitySlider').find('.max-slider-handle')[0].getAttribute('aria-valuetext');
+        expect(ariaValueText1).toBeNull();
+        expect(ariaValueText2).toBeNull();
+      });
     });
 });