diff --git a/accessible/atk/nsMaiInterfaceText.cpp b/accessible/atk/nsMaiInterfaceText.cpp
index 6e421d27bd8..0386ef8343f 100644
--- a/accessible/atk/nsMaiInterfaceText.cpp
+++ b/accessible/atk/nsMaiInterfaceText.cpp
@@ -586,9 +586,8 @@ setCaretOffsetCB(AtkText *aText, gint aOffset)
   }
 
   if (ProxyAccessible* proxy = GetProxy(ATK_OBJECT(aText))) {
-    if (proxy->SetCaretOffset(aOffset)) {
-      return TRUE;
-    }
+    proxy->SetCaretOffset(aOffset);
+    return TRUE;
   }
 
   return FALSE;
diff --git a/accessible/ipc/DocAccessibleChild.cpp b/accessible/ipc/DocAccessibleChild.cpp
index 9ae1b5e6d5e..813fd16e783 100644
--- a/accessible/ipc/DocAccessibleChild.cpp
+++ b/accessible/ipc/DocAccessibleChild.cpp
@@ -390,13 +390,10 @@ DocAccessibleChild::RecvCaretOffset(const uint64_t& aID, int32_t* aOffset)
 
 bool
 DocAccessibleChild::RecvSetCaretOffset(const uint64_t& aID,
-                                       const int32_t& aOffset,
-                                       bool* aRetVal)
+                                       const int32_t& aOffset)
 {
   HyperTextAccessible* acc = IdToHyperTextAccessible(aID);
-  *aRetVal = false;
   if (acc && acc->IsTextRole() && acc->IsValidOffset(aOffset)) {
-    *aRetVal = true;
     acc->SetCaretOffset(aOffset);
   }
   return true;
diff --git a/accessible/ipc/DocAccessibleChild.h b/accessible/ipc/DocAccessibleChild.h
index 6fbb5c84479..0ac72e9fdd1 100644
--- a/accessible/ipc/DocAccessibleChild.h
+++ b/accessible/ipc/DocAccessibleChild.h
@@ -103,8 +103,8 @@ public:
     override;
   virtual bool RecvCaretOffset(const uint64_t& aID, int32_t* aOffset)
     override;
-  virtual bool RecvSetCaretOffset(const uint64_t& aID, const int32_t& aOffset,
-                                  bool* aValid) override;
+  virtual bool RecvSetCaretOffset(const uint64_t& aID, const int32_t& aOffset)
+    override;
 
   virtual bool RecvCharacterCount(const uint64_t& aID, int32_t* aCount)
      override;
diff --git a/accessible/ipc/PDocAccessible.ipdl b/accessible/ipc/PDocAccessible.ipdl
index 182cbc26f7a..d29b56f36bd 100644
--- a/accessible/ipc/PDocAccessible.ipdl
+++ b/accessible/ipc/PDocAccessible.ipdl
@@ -92,7 +92,7 @@ child:
   // TextSubstring is getText in IDL.
   prio(high) sync CaretLineNumber(uint64_t aID) returns(int32_t aLineNumber);
   prio(high) sync CaretOffset(uint64_t aID) returns(int32_t aOffset);
-  prio(high) sync SetCaretOffset(uint64_t aID, int32_t aOffset) returns (bool aValid);
+   async SetCaretOffset(uint64_t aID, int32_t aOffset);
   prio(high) sync CharacterCount(uint64_t aID) returns(int32_t aCount);
   prio(high) sync SelectionCount(uint64_t aID) returns(int32_t aCount);
   prio(high) sync TextSubstring(uint64_t aID, int32_t aStartOffset, int32_t
diff --git a/accessible/ipc/ProxyAccessible.cpp b/accessible/ipc/ProxyAccessible.cpp
index d4db727243b..5654a87cf7a 100644
--- a/accessible/ipc/ProxyAccessible.cpp
+++ b/accessible/ipc/ProxyAccessible.cpp
@@ -216,12 +216,10 @@ ProxyAccessible::CaretOffset()
   return offset;
 }
 
-bool
+void
 ProxyAccessible::SetCaretOffset(int32_t aOffset)
 {
-  bool valid = false;
-  unused << mDoc->SendSetCaretOffset(mID, aOffset, &valid);
-  return valid;
+  unused << mDoc->SendSetCaretOffset(mID, aOffset);
 }
 
 int32_t
diff --git a/accessible/ipc/ProxyAccessible.h b/accessible/ipc/ProxyAccessible.h
index b6176973c99..d1ecf209e23 100644
--- a/accessible/ipc/ProxyAccessible.h
+++ b/accessible/ipc/ProxyAccessible.h
@@ -132,7 +132,7 @@ public:
 
   int32_t CaretLineNumber();
   int32_t CaretOffset();
-  bool SetCaretOffset(int32_t aOffset);
+  void SetCaretOffset(int32_t aOffset);
 
   int32_t CharacterCount();
   int32_t SelectionCount();