diff --git a/accessible/basetypes/HyperTextAccessibleBase.cpp b/accessible/basetypes/HyperTextAccessibleBase.cpp
index c2272a039dd1..f9f4a48cf48e 100644
--- a/accessible/basetypes/HyperTextAccessibleBase.cpp
+++ b/accessible/basetypes/HyperTextAccessibleBase.cpp
@@ -64,4 +64,8 @@ int32_t HyperTextAccessibleBase::GetChildOffset(uint32_t aChildIndex,
   return lastTextOffset;
 }
 
+uint32_t HyperTextAccessibleBase::CharacterCount() const {
+  return GetChildOffset(Acc()->ChildCount());
+}
+
 }  // namespace mozilla::a11y
diff --git a/accessible/basetypes/HyperTextAccessibleBase.h b/accessible/basetypes/HyperTextAccessibleBase.h
index a3fbbc5e1ec2..eca948b50f62 100644
--- a/accessible/basetypes/HyperTextAccessibleBase.h
+++ b/accessible/basetypes/HyperTextAccessibleBase.h
@@ -48,6 +48,11 @@ class HyperTextAccessibleBase {
   virtual int32_t GetChildOffset(uint32_t aChildIndex,
                                  bool aInvalidateAfter = false) const;
 
+  /**
+   * Return character count within the hypertext accessible.
+   */
+  uint32_t CharacterCount() const;
+
  protected:
   virtual const Accessible* Acc() const = 0;
   Accessible* Acc() {
diff --git a/accessible/generic/HyperTextAccessible.h b/accessible/generic/HyperTextAccessible.h
index c70d0d6efea9..7b45f6be9df9 100644
--- a/accessible/generic/HyperTextAccessible.h
+++ b/accessible/generic/HyperTextAccessible.h
@@ -144,11 +144,6 @@ class HyperTextAccessible : public AccessibleWrap,
   //////////////////////////////////////////////////////////////////////////////
   // TextAccessible
 
-  /**
-   * Return character count within the hypertext accessible.
-   */
-  uint32_t CharacterCount() const { return GetChildOffset(ChildCount()); }
-
   /**
    * Get a character at the given offset (don't support magic offsets).
    */