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diff --git a/bin/collector b/bin/collector
index 4fec65e..e59eac7 100755
--- a/bin/collector
+++ b/bin/collector
@@ -3,8 +3,10 @@
Process.setproctitle("discourse prometheus-collector")
+# We need the ABI version {MAJOR}.{MINOR}.0 here.
+abi_version = ENV['GEM_PATH'].split("/")[-1]
version = File.read(File.expand_path("../../prometheus_exporter_version", __FILE__)).strip
-spec_file = File.expand_path("../../gems/#{RUBY_VERSION}/specifications/prometheus_exporter-#{version}.gemspec", __FILE__)
+spec_file = File.expand_path("../../gems/#{abi_version}/specifications/prometheus_exporter-#{version}.gemspec", __FILE__)
spec = Gem::Specification.load spec_file
spec.activate
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