diff --git a/CHANGELOG.md b/CHANGELOG.md
index daca229d..4527a6a7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ### Unreleased
 
+- Fix `boundsOfString()` with `lineBreak: false` leaving out `wordSpacing`, so its width now matches the rendered text and its underline
 - Fix the underline, strike, link and goTo of wrapped text, and `boundsOfString()` with a `width`, counting `characterSpacing` and `wordSpacing` twice, so they no longer run past the text and match the same text drawn with `lineBreak: false`
 - Fix the Node build throwing once a bundler inlines it into an application bundle, `Cannot find module '#standard-fonts/Helvetica'` on the first document from an ESM bundle and `Invalid URL` while importing a CommonJS one, because the standard font metrics and the PDF/A ICC profile were resolved relative to pdfkit's own package directory at import time. Both are now resolved on first use, a standard font that cannot be loaded names itself and the fix in its error, and `registerStdFonts` is exported from the Node build as it already was from the browser build, so a bundle can register the fonts it uses from `pdfkit/standard-fonts/<Name>`. The Node build now requires the standard fonts by a path relative to the built file, which replaces the `#standard-fonts/*` import mapping and lets an ESM bundle load them from a copy of `js/standard-fonts` next to it. Fixes #1801
 - Fix `doc.list()` drawing the label of a `numbered` or `lettered` item with the line wrapper's own options object, which threw `unsupported number: NaN` for `align` `center` and `right`, applied a word spacing derived from the previous line to the label for `align` `justify`, and sized the underline, strike, link and goTo of every label after the first from the previous item's text
diff --git a/lib/mixins/text.js b/lib/mixins/text.js
index 7c42b5e3..78c872d7 100644
--- a/lib/mixins/text.js
+++ b/lib/mixins/text.js
@@ -184,7 +184,13 @@ export default {
     } else {
       // render paragraphs as single lines
       for (let line of string.split('\n')) {
-        const lineWidth = this.widthOfString(line, options);
+        let lineWidth = this.widthOfString(line, options);
+        if (options.wordSpacing) {
+          // whitespace runs were collapsed above, so each gap is one character
+          const trimmed = line.trim();
+          const space = /\s/g;
+          while (space.test(trimmed)) lineWidth += options.wordSpacing;
+        }
         this.y += lineHeight;
         contentWidth = Math.max(contentWidth, lineWidth);
       }
diff --git a/tests/unit/text.spec.js b/tests/unit/text.spec.js
index d883bc5a..bb7a572f 100644
--- a/tests/unit/text.spec.js
+++ b/tests/unit/text.spec.js
@@ -242,6 +242,27 @@ Q
         new RegExp(`50 [\\d.]+ m\n${end.replace('.', '\\.')}\\d* [\\d.]+ l`),
       ]);
     });
+
+    test('bounds of text with lineBreak false and wordSpacing', () => {
+      const docData = logData(document);
+      const options = { lineBreak: false, underline: true, wordSpacing: 5 };
+      const bounds = document.boundsOfString(
+        'Hello big world',
+        50,
+        50,
+        options,
+      );
+
+      document.text('Hello big world', 50, 50, options);
+      document.end();
+
+      // as wide as the underline, which includes the word spacing
+      expect(bounds.width.toFixed(2)).toBe('88.74');
+      expect(docData).toContainChunk([
+        'stream',
+        /50 [\d.]+ m\n138\.74\d* [\d.]+ l/,
+      ]);
+    });
   });
 
   describe('text with structure parent links', () => {