diff --git a/Parser/intrcheck.c b/Parser/intrcheck.c
index a2a3145..7fe6205 100644
--- a/Parser/intrcheck.c
+++ b/Parser/intrcheck.c
@@ -219,3 +219,8 @@
 }
 
 #endif /* !OK */
+
+void
+PyOS_AfterFork()
+{
+}