diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a8f1b2ca..a95d92e5d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,8 +8,12 @@ with the exception that 0.x versions can break between minor versions.
 
 ## [Unreleased]
 ### Fixed
-- A single pipe (optional whitespace) now ends a table instead of crashing or
-  being treated as an empty row, for consistency with GitHub (#255).
+- GitHub tables: A single pipe (optional whitespace) now ends a table
+  instead of crashing or being treated as an empty row, for consistency
+  with GitHub (#255).
+- GitHub strikethrough: A single tilde now also works, and more than two
+  tildes are not accepted anymore. This brings us in line with what
+  GitHub actually does, which is a bit underspecified (#267)
 
 ## [0.19.0] - 2022-06-02
 ### Added
diff --git a/commonmark-ext-gfm-strikethrough/src/main/java/org/commonmark/ext/gfm/strikethrough/internal/StrikethroughDelimiterProcessor.java b/commonmark-ext-gfm-strikethrough/src/main/java/org/commonmark/ext/gfm/strikethrough/internal/StrikethroughDelimiterProcessor.java
index 7d54eedf2..a26953d28 100644
--- a/commonmark-ext-gfm-strikethrough/src/main/java/org/commonmark/ext/gfm/strikethrough/internal/StrikethroughDelimiterProcessor.java
+++ b/commonmark-ext-gfm-strikethrough/src/main/java/org/commonmark/ext/gfm/strikethrough/internal/StrikethroughDelimiterProcessor.java
@@ -22,13 +22,13 @@ public char getClosingCharacter() {
 
     @Override
     public int getMinLength() {
-        return 2;
+        return 1;
     }
 
     @Override
     public int process(DelimiterRun openingRun, DelimiterRun closingRun) {
-        if (openingRun.length() >= 2 && closingRun.length() >= 2) {
-            // Use exactly two delimiters even if we have more, and don't care about internal openers/closers.
+        if (openingRun.length() == closingRun.length() && openingRun.length() <= 2) {
+            // GitHub only accepts either one or two delimiters, but not a mix or more than that.
 
             Text opener = openingRun.getOpener();
 
@@ -36,19 +36,19 @@ public int process(DelimiterRun openingRun, DelimiterRun closingRun) {
             Node strikethrough = new Strikethrough();
 
             SourceSpans sourceSpans = new SourceSpans();
-            sourceSpans.addAllFrom(openingRun.getOpeners(2));
+            sourceSpans.addAllFrom(openingRun.getOpeners(openingRun.length()));
 
             for (Node node : Nodes.between(opener, closingRun.getCloser())) {
                 strikethrough.appendChild(node);
                 sourceSpans.addAll(node.getSourceSpans());
             }
 
-            sourceSpans.addAllFrom(closingRun.getClosers(2));
+            sourceSpans.addAllFrom(closingRun.getClosers(closingRun.length()));
             strikethrough.setSourceSpans(sourceSpans.getSourceSpans());
 
             opener.insertAfter(strikethrough);
 
-            return 2;
+            return openingRun.length();
         } else {
             return 0;
         }
diff --git a/commonmark-ext-gfm-strikethrough/src/test/java/org/commonmark/ext/gfm/strikethrough/StrikethroughTest.java b/commonmark-ext-gfm-strikethrough/src/test/java/org/commonmark/ext/gfm/strikethrough/StrikethroughTest.java
index e2e3b95c4..76cf929e9 100644
--- a/commonmark-ext-gfm-strikethrough/src/test/java/org/commonmark/ext/gfm/strikethrough/StrikethroughTest.java
+++ b/commonmark-ext-gfm-strikethrough/src/test/java/org/commonmark/ext/gfm/strikethrough/StrikethroughTest.java
@@ -26,12 +26,12 @@ public class StrikethroughTest extends RenderingTestCase {
             .extensions(EXTENSIONS).build();
 
     @Test
-    public void oneTildeIsNotEnough() {
-        assertRendering("~foo~", "<p>~foo~</p>\n");
+    public void oneTildeIsEnough() {
+        assertRendering("~foo~", "<p><del>foo</del></p>\n");
     }
 
     @Test
-    public void twoTildesYay() {
+    public void twoTildesWorksToo() {
         assertRendering("~~foo~~", "<p><del>foo</del></p>\n");
     }
 
@@ -48,23 +48,22 @@ public void unmatched() {
 
     @Test
     public void threeInnerThree() {
-        assertRendering("a ~~~foo~~~", "<p>a ~<del>foo</del>~</p>\n");
+        assertRendering("a ~~~foo~~~", "<p>a ~~~foo~~~</p>\n");
     }
 
     @Test
     public void twoInnerThree() {
-        assertRendering("~~foo~~~", "<p><del>foo</del>~</p>\n");
+        assertRendering("~~foo~~~", "<p>~~foo~~~</p>\n");
     }
 
     @Test
     public void tildesInside() {
         assertRendering("~~foo~bar~~", "<p><del>foo~bar</del></p>\n");
         assertRendering("~~foo~~bar~~", "<p><del>foo</del>bar~~</p>\n");
-        assertRendering("~~foo~~~bar~~", "<p><del>foo</del>~bar~~</p>\n");
-        assertRendering("~~foo~~~~bar~~", "<p><del>foo</del><del>bar</del></p>\n");
-        assertRendering("~~foo~~~~~bar~~", "<p><del>foo</del>~<del>bar</del></p>\n");
-        assertRendering("~~foo~~~~~~bar~~", "<p><del>foo</del>~~<del>bar</del></p>\n");
-        assertRendering("~~foo~~~~~~~bar~~", "<p><del>foo</del>~~~<del>bar</del></p>\n");
+        assertRendering("~~foo~~~bar~~", "<p><del>foo~~~bar</del></p>\n");
+        assertRendering("~~foo~~~~bar~~", "<p><del>foo~~~~bar</del></p>\n");
+        assertRendering("~~foo~~~~~bar~~", "<p><del>foo~~~~~bar</del></p>\n");
+        assertRendering("~~foo~~~~~~bar~~", "<p><del>foo~~~~~~bar</del></p>\n");
     }
 
     @Test