diff --git a/groups/speciallinear.jl b/groups/speciallinear.jl
index 4062ae8..f02760f 100644
--- a/groups/speciallinear.jl
+++ b/groups/speciallinear.jl
@@ -10,7 +10,8 @@ struct SpecialLinearGroup <: SymmetrizedGroup
         if p == 0
             G = MatrixSpace(Nemo.ZZ, n, n)
         else
-            G = MatrixSpace(FiniteField(p), n, n)
+            F, a = FiniteField(p, 1, "a")
+            G = MatrixSpace(F, n, n)
         end
         return new(args, G)
     end