diff --git a/lang_lock.c b/lang_lock.c
index 106faf9..59f0846 100644
--- a/lang_lock.c
+++ b/lang_lock.c
@@ -12,6 +12,40 @@
 #ifdef MULTI_PERL
 perl_key last_py_tstate;
 
+#ifndef WIN32
+#include <pthread.h>
+#include <unistd.h>
+/* Thread-local GIL state across prepare → parent/child (same thread). */
+static __thread PyGILState_STATE atfork_gstate;
+
+static void
+_atfork_prepare(void)
+{
+#if PY_VERSION_HEX >= 0x03070000
+    atfork_gstate = PyGILState_Ensure();
+    PyOS_BeforeFork();
+#endif
+}
+
+static void
+_atfork_parent(void)
+{
+#if PY_VERSION_HEX >= 0x03070000
+    PyOS_AfterFork_Parent();
+    PyGILState_Release(atfork_gstate);
+#endif
+}
+
+static void
+_atfork_child(void)
+{
+#if PY_VERSION_HEX >= 0x03070000
+    PyOS_AfterFork_Child();
+    PyGILState_Release(atfork_gstate);
+#endif
+}
+#endif
+
 void
 lang_lock_init()
 {
@@ -23,6 +57,13 @@ lang_lock_init()
 #endif
 	Py_FatalError("Can't create TSD key for py_tstate");
     }
+#ifndef WIN32
+    static bool atfork_registered = false;
+    if (!atfork_registered) {
+        (void) pthread_atfork(_atfork_prepare, _atfork_parent, _atfork_child);
+        atfork_registered = true;
+    }
+#endif
 }
 
 #else /* MULTI_PERL */