diff --git a/logfire/_internal/config.py b/logfire/_internal/config.py
index 8edb69e8d..8fa304337 100644
--- a/logfire/_internal/config.py
+++ b/logfire/_internal/config.py
@@ -92,6 +92,7 @@
     SeededRandomIdGenerator,
     UnexpectedResponse,
     ensure_data_dir_exists,
+    handle_internal_errors,
     read_toml_file,
     suppress_instrumentation,
 )
@@ -907,6 +908,14 @@ def check_token():
             else:
                 meter_provider = NoOpMeterProvider()
 
+            def fix_pid():  # pragma: no cover
+                with handle_internal_errors():
+                    new_resource = resource.merge(Resource({ResourceAttributes.PROCESS_PID: os.getpid()}))
+                    tracer_provider._resource = new_resource  # type: ignore
+                    meter_provider._resource = new_resource  # type: ignore
+
+            os.register_at_fork(after_in_child=fix_pid)
+
             # we need to shut down any existing providers to avoid leaking resources (like threads)
             # but if this takes longer than 100ms you should call `logfire.shutdown` before reconfiguring
             self._meter_provider.shutdown(