diff --git a/src/maps/perf_event_array.cpp b/src/maps/perf_event_array.cpp
index a14d11b..cfebb3d 100644
--- a/src/maps/perf_event_array.cpp
+++ b/src/maps/perf_event_array.cpp
@@ -89,13 +89,12 @@ void PerfEventArray::lost_callback_wrapper(void *ctx, int cpu,
                                            unsigned long long cnt) {
   auto *self = static_cast<PerfEventArray *>(ctx);
 
-  if (self->lost_callback_.is_none()) {
-    return;
-  }
-
   py::gil_scoped_acquire acquire;
 
   try {
+    if (self->lost_callback_.is_none()) {
+      return;
+    }
     self->lost_callback_(cpu, cnt);
   } catch (const py::error_already_set &e) {
     PyErr_Print();
diff --git a/src/maps/perf_event_array.h b/src/maps/perf_event_array.h
index 1b75440..9f77454 100644
--- a/src/maps/perf_event_array.h
+++ b/src/maps/perf_event_array.h
@@ -2,10 +2,10 @@
 #define PYLIBBPF_PERF_EVENT_ARRAY_H
 
 #include <libbpf.h>
+#include <memory>
 #include <pybind11/functional.h>
 #include <pybind11/pybind11.h>
 #include <string>
-#include <memory>
 
 class StructParser;
 class BpfMap;