diff --git a/ext/sqlite/libsqlite/src/btree_rb.c b/ext/sqlite/libsqlite/src/btree_rb.c
index 39a842032af..52b4bed0106 100644
--- a/ext/sqlite/libsqlite/src/btree_rb.c
+++ b/ext/sqlite/libsqlite/src/btree_rb.c
@@ -281,7 +281,7 @@ static char *append_node(char * orig, BtRbNode *pNode, int indent)
 static void print_node(BtRbNode *pNode)
 {
     char * str = append_node(0, pNode, 0);
-    printf(str);
+    printf("%s", str);
 }
 
 /*