diff --git a/src/interface.jl b/src/interface.jl
index aa90e30e32fe115f032c5f2053d2d9451ca795ae..53d15a1dc382aaf9deb371716a148cfa76eb995e 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -1,4 +1,4 @@
-export AbstractProcess, PhycicalProcess, SimulatedProcess
+export AbstractProcess, PhysicalProcess, SimulatedProcess
 export  num_outputs,
         num_inputs,
         outputrange,
@@ -10,7 +10,7 @@ export  num_outputs,
 
 # Interface specification ===================================================================
 abstract type AbstractProcess end
-abstract type PhycicalProcess  <: AbstractProcess end
+abstract type PhysicalProcess  <: AbstractProcess end
 abstract type SimulatedProcess <: AbstractProcess end
 
 num_outputs(p::AbstractProcess) = error("Function not implemented for $(typeof(p))")