1 files changed, 1 insertions, 1 deletions
diff --git a/thread.c b/thread.c
index dfbcfcb8ab..bed65517a0 100644
--- a/thread.c
+++ b/thread.c
@@ -75,7 +75,7 @@
 #define THREAD_DEBUG 0
 #endif
 
-VALUE rb_cThreadShield;
+static VALUE rb_cThreadShield;
 
 static VALUE sym_immediate;
 static VALUE sym_on_blocking;