diff --git a/indra/llmath/llmatrix4a.h b/indra/llmath/llmatrix4a.h
index f459e99a1ca5d9d0a0ddf56659b7fd258252beb1..95745f361ee7fc3d02f4ae8954b9500bcb5774a1 100644
--- a/indra/llmath/llmatrix4a.h
+++ b/indra/llmath/llmatrix4a.h
@@ -276,9 +276,10 @@ class alignas(16) LLMatrix4a
 	}
 
 	template<int N>
-	inline LLVector4a getColumn()
+	inline LLVector4a getColumn() const
 	{
 		LLVector4a v;
+		v.clear();
 		v.copyComponent<0>(mMatrix[0].getScalarAt<N>());
 		v.copyComponent<1>(mMatrix[1].getScalarAt<N>());
 		v.copyComponent<2>(mMatrix[2].getScalarAt<N>());