diff --git a/src/pack_unpack.c b/src/pack_unpack.c
index cdce28c..18f9ccb 100644
--- a/src/pack_unpack.c
+++ b/src/pack_unpack.c
@@ -34,7 +34,7 @@ static const char * const type_names[] = {
 
 #define type_name(x) type_names[json_typeof(x)]
 
-static const char * const unpack_value_starters = "{[siIbfFOon";
+static const char unpack_value_starters[] = "{[siIbfFOon";
 
 
 static void scanner_init(scanner_t *s, json_error_t *error,