diff --git a/src/MultivariateBases.jl b/src/MultivariateBases.jl
index 038680a..0127d0a 100644
--- a/src/MultivariateBases.jl
+++ b/src/MultivariateBases.jl
@@ -65,14 +65,13 @@ function algebra(
     return Algebra{typeof(basis),B,M}(basis)
 end
 
-# Needed ?
-#function MA.promote_operation(
-#    ::typeof(algebra),
-#    BT::Type{
-#        <:Union{QuotientBasis{Polynomial{B,M}},FullBasis{B,M},SubBasis{B,M}},
-#    },
-#) where {B,M}
-#    return Algebra{BT,B,M}
-#end
+function MA.promote_operation(
+    ::typeof(algebra),
+    BT::Type{
+        <:Union{QuotientBasis{Polynomial{B,M}},FullBasis{B,M},SubBasis{B,M}},
+    },
+) where {B,M}
+    return Algebra{BT,B,M}
+end
 
 end # module
diff --git a/test/quotient.jl b/test/quotient.jl
index 705765d..8a03179 100644
--- a/test/quotient.jl
+++ b/test/quotient.jl
@@ -19,7 +19,7 @@ end
     coeffs = [3, -2, 1]
     @test coefficients(p, basis) == coeffs
     a = MB.algebra_element(p)
-    @test StarAlgebras.coeffs(a, basis) == coeffs
+    @test SA.coeffs(a, basis) == coeffs
     explicit = MB.explicit_basis(a)
     exp = MB.algebra_element(SA.coeffs(a, explicit), explicit)
     @test SA.coeffs(exp, basis) == coeffs