diff --git a/ChangeLog b/ChangeLog
index 3d0f19dc04..7528cef919 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Thu Mar 15 15:04:41 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Thu Mar 15 15:04:54 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* util.c (ruby_strtod): no need to check same digit for hexdigit
+	  twice.  [ruby-dev:45363][Bug #6146]
 
 	* parse.y (sym_check_asciionly): check ascii compatibility before
 	  scanning for code range.
diff --git a/util.c b/util.c
index 39ec3e9783..fca9e67541 100644
--- a/util.c
+++ b/util.c
@@ -1977,8 +1977,11 @@ break2:
 	    nd0 = -4;
 
 	    if (!*++s || !(s1 = strchr(hexdigit, *s))) goto ret0;
-	    while (*s == '0') s++;
-	    if ((s1 = strchr(hexdigit, *s)) != NULL) {
+	    if (*s == '0') {
+		while (*++s == '0');
+		s1 = strchr(hexdigit, *s);
+	    }
+	    if (s1 != NULL) {
 		do {
 		    adj += aadj * ((s1 - hexdigit) & 15);
 		    nd0 += 4;