diff --git a/src/runtime/cgo/gcc_darwin_arm64.c b/src/runtime/cgo/gcc_darwin_arm64.c
index daf3d34922..b64a063b98 100644
--- a/src/runtime/cgo/gcc_darwin_arm64.c
+++ b/src/runtime/cgo/gcc_darwin_arm64.c
@@ -86,6 +86,8 @@ threadentry(void *v)
 	ts = *(ThreadStart*)v;
 	free(v);
 
+	darwin_arm_init_thread_exception_port();
+
 	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
 	return nil;
 }
@@ -148,5 +150,8 @@ x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
 	// yes, tlsbase from mrs might not be correctly aligned.
 	inittls(tlsg, (void**)((uintptr)tlsbase & ~7));
 
+	darwin_arm_init_mach_exception_handler();
+	darwin_arm_init_thread_exception_port();
+
 	init_working_dir();
 }