diff --git a/dist/index.js b/dist/index.js
index 79622bef..b19a78ca 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -538,6 +538,7 @@ const installer = __importStar(__nccwpck_require__(1480));
 const archSynonyms = {
     'x86': 'x86',
     'x64': 'x64',
+    'x86_64': 'x64',
     'aarch64': 'aarch64',
     'arm64': 'aarch64'
 };
diff --git a/lib/setup-julia.js b/lib/setup-julia.js
index 5f4dbda5..471adfd0 100644
--- a/lib/setup-julia.js
+++ b/lib/setup-julia.js
@@ -46,6 +46,7 @@ const installer = __importStar(require("./installer"));
 const archSynonyms = {
     'x86': 'x86',
     'x64': 'x64',
+    'x86_64': 'x64',
     'aarch64': 'aarch64',
     'arm64': 'aarch64'
 };
diff --git a/src/setup-julia.ts b/src/setup-julia.ts
index 19d4b4ce..9ff3990a 100644
--- a/src/setup-julia.ts
+++ b/src/setup-julia.ts
@@ -15,6 +15,7 @@ import * as installer from './installer'
 const archSynonyms = {
     'x86': 'x86',
     'x64': 'x64',
+    'x86_64': 'x64',
     'aarch64': 'aarch64',
     'arm64': 'aarch64'
 }