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-rw-r--r--lib/rubygems/installer.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rubygems/installer.rb b/lib/rubygems/installer.rb
index 33d2f78d46..c80981682f 100644
--- a/lib/rubygems/installer.rb
+++ b/lib/rubygems/installer.rb
@@ -641,7 +641,7 @@ version = "#{Gem::Requirement.default}"
if ARGV.first
str = ARGV.first
str = str.dup.force_encoding("BINARY") if str.respond_to? :force_encoding
- if str =~ /\\A_(.*)_\\z/
+ if str =~ /\\A_(.*)_\\z/ and Gem::Version.correct?($1) then
version = $1
ARGV.shift
end