diff --git a/packages/ember-application/lib/system/application.js b/packages/ember-application/lib/system/application.js
index 974aaf7bb25..8d5fdc1e531 100644
--- a/packages/ember-application/lib/system/application.js
+++ b/packages/ember-application/lib/system/application.js
@@ -1050,24 +1050,28 @@ function registerLibraries() {
   }
 }
 
-function logLibraryVersions() {
-  if (ENV.LOG_VERSION) {
-    // we only need to see this once per Application#init
-    ENV.LOG_VERSION = false;
-    let libs = libraries._registry;
+let logLibraryVersions;
 
-    let nameLengths = libs.map(item => get(item, 'name.length'));
+runInDebug(() => {
+  logLibraryVersions = function() {
+    if (ENV.LOG_VERSION) {
+      // we only need to see this once per Application#init
+      ENV.LOG_VERSION = false;
+      let libs = libraries._registry;
 
-    let maxNameLength = Math.max.apply(this, nameLengths);
+      let nameLengths = libs.map(item => get(item, 'name.length'));
 
-    debug('-------------------------------');
-    for (let i = 0; i < libs.length; i++) {
-      let lib = libs[i];
-      let spaces = new Array(maxNameLength - lib.name.length + 1).join(' ');
-      debug([lib.name, spaces, ' : ', lib.version].join(''));
+      let maxNameLength = Math.max.apply(this, nameLengths);
+
+      debug('-------------------------------');
+      for (let i = 0; i < libs.length; i++) {
+        let lib = libs[i];
+        let spaces = new Array(maxNameLength - lib.name.length + 1).join(' ');
+        debug([lib.name, spaces, ' : ', lib.version].join(''));
+      }
+      debug('-------------------------------');
     }
-    debug('-------------------------------');
   }
-}
+});
 
 export default Application;