diff --git a/SL.jl b/SL.jl
index 815005b..36c381a 100644
--- a/SL.jl
+++ b/SL.jl
@@ -43,6 +43,8 @@ import Base.LinAlg.det
 function det(M::Array{Mod,2})
     if size(M,1) ≠ size(M,2)
         d = Mod(0,M[1,1].mod)
+    elseif size(M,1) == 1
+        d = M[1,1]
     elseif size(M,1) == 2
         d =  M[1,1]*M[2,2] - M[1,2]*M[2,1]
     else