diff --git a/src/MOL_discretization.jl b/src/MOL_discretization.jl
index 32a7acf33..2d76662a4 100644
--- a/src/MOL_discretization.jl
+++ b/src/MOL_discretization.jl
@@ -8,7 +8,7 @@ end
 
 function throw_bc_err(bc)
     throw(BoundaryConditionError(
-        "Could not not recognize boundary condition '$(bc.lhs) ~ $(bc.rhs)'"
+        "Could not recognize boundary condition '$(bc.lhs) ~ $(bc.rhs)'"
     ))
 end
 # Get boundary conditions from an array