diff --git a/bindings/ruby/ext/options.rb b/bindings/ruby/ext/options.rb
index 09baf9b2..5fe600a6 100644
--- a/bindings/ruby/ext/options.rb
+++ b/bindings/ruby/ext/options.rb
@@ -18,7 +18,7 @@ class Options
 
     output = nil
     Dir.chdir __dir__ do
-      output = IO.popen([@cmake, "-S", "sources", "-B", "build", "-L"]).read
+      output = IO.popen([@cmake, "-S", "sources", "-B", "build", "-L"]) {|io| io.read}
     end
     @cmake_options = output.lines.drop_while {|line| line.chomp != "-- Cache values"}.drop(1)
                        .filter_map {|line|