Make private functions static so we don't pollute the namespace
diff --git a/Modules/_sre.c b/Modules/_sre.c
index 0357764..640f388 100644
--- a/Modules/_sre.c
+++ b/Modules/_sre.c
@@ -353,7 +353,8 @@
     return 0;
 }
 
-void lastmark_restore(SRE_STATE *state, int lastmark)
+static void
+lastmark_restore(SRE_STATE *state, int lastmark)
 {
     if (state->lastmark > lastmark) {
         memset(