diff --git a/build.js b/build.js
index e43bea7..16336ba 100644
--- a/build.js
+++ b/build.js
@@ -9,7 +9,9 @@ function puts(error, stdout, stderr) {
   console.error(stderr);
 }
 
-switch (os.type()) {
+const osType = os.type();
+
+switch (osType) {
   case "Linux":
     childProcess.exec("npm run build-linux", puts);
     break;
@@ -17,5 +19,5 @@ switch (os.type()) {
     childProcess.exec("npm run build-windows", puts);
     break;
   default:
-    throw new Error("Unsupported OS found: " + os.type());
+    throw new Error("Unsupported operating system found: " + osType);
 }