diff --git a/indra/newview/llcontrolavatar.cpp b/indra/newview/llcontrolavatar.cpp
index 17f34e41d..e0e7e820b 100644
--- a/indra/newview/llcontrolavatar.cpp
+++ b/indra/newview/llcontrolavatar.cpp
@@ -606,7 +606,7 @@ bool LLControlAvatar::shouldRenderRigged() const
 }
 
 // virtual
-BOOL LLControlAvatar::isImpostor()
+BOOL LLControlAvatar::isImpostor() const
 {
     if (mRootVolp && mRootVolp->isAttachment())
     {
diff --git a/indra/newview/llcontrolavatar.h b/indra/newview/llcontrolavatar.h
index dca0ec0ac..7776ed901 100644
--- a/indra/newview/llcontrolavatar.h
+++ b/indra/newview/llcontrolavatar.h
@@ -76,7 +76,7 @@ public:
 
     bool shouldRenderRigged() const override;
 
-	virtual BOOL isImpostor(); 
+	BOOL isImpostor() const override;
     
     bool mPlaying;
 
diff --git a/indra/newview/llvoavatar.h b/indra/newview/llvoavatar.h
index a996f6e9b..d28527499 100644
--- a/indra/newview/llvoavatar.h
+++ b/indra/newview/llvoavatar.h
@@ -555,7 +555,7 @@ private:
 	// Impostors
 	//--------------------------------------------------------------------
 public:
-	BOOL 		isImpostor() const;
+	virtual BOOL isImpostor() const;
 	BOOL 		shouldImpostor(const U32 rank_factor = 1) const;
 	BOOL 		needsImpostorUpdate() const;
 	const LLVector3& getImpostorOffset() const;