diff --git a/src/julia.h b/src/julia.h
index 8cd070885c6fd..c16f9000fd89e 100644
--- a/src/julia.h
+++ b/src/julia.h
@@ -1515,6 +1515,7 @@ JL_DLLEXPORT int jl_is_debugbuild(void) JL_NOTSAFEPOINT;
 JL_DLLEXPORT jl_sym_t *jl_get_UNAME(void) JL_NOTSAFEPOINT;
 JL_DLLEXPORT jl_sym_t *jl_get_ARCH(void) JL_NOTSAFEPOINT;
 JL_DLLEXPORT jl_value_t *jl_get_libllvm(void) JL_NOTSAFEPOINT;
+extern JL_DLLIMPORT int jl_n_threads;
 
 // environment entries
 JL_DLLEXPORT jl_value_t *jl_environ(int i);
diff --git a/src/threading.c b/src/threading.c
index 8f8dd45c28507..80722323c9367 100644
--- a/src/threading.c
+++ b/src/threading.c
@@ -221,7 +221,6 @@ jl_get_ptls_states_func jl_get_ptls_states_getter(void)
 }
 #endif
 
-JL_DLLEXPORT int jl_n_threads;
 jl_ptls_t *jl_all_tls_states JL_GLOBALLY_ROOTED;
 
 // return calling thread's ID