diff --git a/src/PythonCall.jl b/src/PythonCall.jl
index 22f7e25e..9c7084d0 100644
--- a/src/PythonCall.jl
+++ b/src/PythonCall.jl
@@ -83,6 +83,8 @@ include("compat/ipython.jl")
 include("compat/tables.jl")
 
 function __init__()
+    ccall(:jl_generating_output, Cint, ()) == 1 && return nothing
+
     C.with_gil() do
         init_consts()
         init_pyconvert()
diff --git a/src/cpython/CPython.jl b/src/cpython/CPython.jl
index 2cb671f6..c5030728 100644
--- a/src/cpython/CPython.jl
+++ b/src/cpython/CPython.jl
@@ -18,6 +18,8 @@ include("gil.jl")
 include("jlwrap.jl")
 
 function __init__()
+    ccall(:jl_generating_output, Cint, ()) == 1 && return nothing
+
     init_context()
     with_gil() do
         init_jlwrap()