1 files changed, 3 insertions, 0 deletions
diff --git a/string.c b/string.c
index 990694f24..7d6f30555 100644
--- a/string.c
+++ b/string.c
@@ -395,6 +395,9 @@ str_new(VALUE klass, const char *ptr, long len)
 	RSTRING(str)->as.heap.ptr = ALLOC_N(char,len+1);
 	STR_SET_NOEMBED(str);
     }
+    else if (len == 0) {
+	ENC_CODERANGE_SET(str, ENC_CODERANGE_7BIT);
+    }
     if (ptr) {
 	memcpy(RSTRING_PTR(str), ptr, len);
     }