diff --git a/js/symbol/shaping.js b/js/symbol/shaping.js
index 40d74961a0b..109a072bcab 100644
--- a/js/symbol/shaping.js
+++ b/js/symbol/shaping.js
@@ -54,7 +54,7 @@ function shapeText(text, glyphs, maxWidth, lineHeight, horizontalAlign, vertical
 
         if (!glyph && codePoint !== newLine) continue;
 
-        if (writingMode === WritingMode.horizontal) {
+        if (!scriptDetection.charAllowsVerticalWritingMode(text[i]) || writingMode === WritingMode.horizontal) {
             positionedGlyphs.push(new PositionedGlyph(codePoint, x, yOffset, glyph, 0));
             if (glyph) x += glyph.advance + spacing;
 
diff --git a/js/util/script_detection.js b/js/util/script_detection.js
index cc760c387b6..b393017716d 100644
--- a/js/util/script_detection.js
+++ b/js/util/script_detection.js
@@ -12,7 +12,7 @@ module.exports.allowsIdeographicBreaking = function(chars) {
 
 module.exports.allowsVerticalWritingMode = function(chars) {
     for (const char of chars) {
-        if (charAllowsVerticalWritingMode(char.charCodeAt(0))) return true;
+        if (exports.charAllowsVerticalWritingMode(char.charCodeAt(0))) return true;
     }
     return false;
 };
@@ -45,7 +45,7 @@ module.exports.charAllowsIdeographicBreaking = function(char) {
     return false;
 };
 
-function charAllowsVerticalWritingMode(char) {
+exports.charAllowsVerticalWritingMode = function(char) {
     // Return early for characters outside all ranges that allow the vertical
     // writing mode.
     if (char < 0x1100) return false;
diff --git a/package.json b/package.json
index 950bcd1f7da..dba87cdb160 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
     "highlight.js": "9.3.0",
     "jsdom": "^9.4.2",
     "lodash.template": "^4.4.0",
-    "mapbox-gl-test-suite": "mapbox/mapbox-gl-test-suite#20289f25516b28d5f5af4f5813659c2d8139fa6d",
+    "mapbox-gl-test-suite": "mapbox/mapbox-gl-test-suite#3462d7e88372be4df11e1ef8c1991bcf3e31aa93",
     "minifyify": "^7.0.1",
     "npm-run-all": "^3.0.0",
     "nyc": "^8.3.0",