diff --git a/src/pocketpy.h b/src/pocketpy.h
index 8bf7977f..62c508c5 100644
--- a/src/pocketpy.h
+++ b/src/pocketpy.h
@@ -14,6 +14,7 @@
 #include "_generated.h"
 #include "export.h"
 #include "vm.h"
+#include "isolated_os.h"
 #include "re.h"
 #include "random.h"