diff --git a/bin/collector b/bin/collector
index 4bdce08178..5edc0a4aee 100755
--- a/bin/collector
+++ b/bin/collector
@@ -3,9 +3,11 @@

 Process.setproctitle("discourse prometheus-collector")

+# We need the ABI version {MAJOR}.{MINOR}.0 here.
+abi_version = ENV['GEM_PATH'].split("/")[-1]
 spec_file =
   File.expand_path(
-    "../../gems/#{RUBY_VERSION}/specifications/#{"prometheus_exporter-#{ENV["PROMETHEUS_EXPORTER_VERSION"]}"}.gemspec",
+    "../../gems/#{abi_version}/specifications/#{"prometheus_exporter-#{ENV["PROMETHEUS_EXPORTER_VERSION"]}"}.gemspec",
     __FILE__,
   )