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-rw-r--r--ext/psych/lib/psych/scalar_scanner.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/psych/lib/psych/scalar_scanner.rb b/ext/psych/lib/psych/scalar_scanner.rb
index 383a8acc1b8..5fafaf30b3d 100644
--- a/ext/psych/lib/psych/scalar_scanner.rb
+++ b/ext/psych/lib/psych/scalar_scanner.rb
@@ -15,7 +15,7 @@ module Psych
# Taken from http://yaml.org/type/int.html
INTEGER = /^(?:[-+]?0b[0-1_,]+ (?# base 2)
|[-+]?0[0-7_,]+ (?# base 8)
- |[-+]?(?:0|[1-9]([0-9]|,[0-9]|_[0-9])*) (?# base 10)
+ |[-+]?(?:0|[1-9](?:[0-9]|,[0-9]|_[0-9])*) (?# base 10)
|[-+]?0x[0-9a-fA-F_,]+ (?# base 16))$/x
attr_reader :class_loader