diff --git a/src/setup-elixir.js b/src/setup-elixir.js
index 24e0b68..72a53be 100644
--- a/src/setup-elixir.js
+++ b/src/setup-elixir.js
@@ -67,8 +67,12 @@ async function getElixirVersion(spec, otpVersion) {
 }
 
 function getVersionFromSpec(spec, versions) {
-  const range = semver.validRange(spec)
-  return semver.maxSatisfying(versions, range)
+  if (versions.includes(spec)) {
+    return spec;
+  } else {
+    const range = semver.validRange(spec)
+    return semver.maxSatisfying(versions, range)
+  }
 }
 
 async function getOtpVersions() {