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-rw-r--r--ext/rpatricia/rpatricia.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/rpatricia/rpatricia.c b/ext/rpatricia/rpatricia.c
index 066f82e..81e0990 100644
--- a/ext/rpatricia/rpatricia.c
+++ b/ext/rpatricia/rpatricia.c
@@ -46,7 +46,7 @@ wrap_node(patricia_node_t *orig)
 static void
 my_ascii2prefix(patricia_tree_t *tree, VALUE str, prefix_t *prefix)
 {
-  char *cstr = StringValuePtr(str);
+  char *cstr = StringValueCStr(str);
   prefix_t *ok = ascii2prefix(cstr, prefix);
 
   if (!ok)