diff --git a/tools/isobuild/compiler-plugin.js b/tools/isobuild/compiler-plugin.js
index 22a2852cd6..3f368886c9 100644
--- a/tools/isobuild/compiler-plugin.js
+++ b/tools/isobuild/compiler-plugin.js
@@ -1072,10 +1072,7 @@ export class PackageSourceBatch {
     // depends on something).
     self.importedSymbolToPackageName = {}; // map from symbol to supplying package name
 
-
-    // List of packages (including weak) that need to load before
-    // this unibuild
-    self.orderedDeps = new Set();
+    self.deps = [];
   }
 
   async init() {
@@ -1098,26 +1095,17 @@ export class PackageSourceBatch {
       skipDebugOnly: true,
       skipProdOnly: true,
       skipTestOnly: true,
-    }, (depUnibuild) => {
+    }, (depUnibuild, { weak, unordered }) => {
       let packageName = depUnibuild.pkg.name;
 
-      self.orderedDeps.add(packageName);
-
       _.each(depUnibuild.declaredExports, function (symbol) {
         // Slightly hacky implementation of test-only exports.
         if (! symbol.testOnly || self.unibuild.pkg.isTest) {
           self.importedSymbolToPackageName[symbol.name] = packageName;
         }
       });
-    });
 
-    // At this point we can't easily know all weak dependencies
-    // that are actually used to pass them to eachUsedUnibuild.
-    // So instead we loop over the packages again to add them.
-    self.unibuild.uses.forEach(uses => {
-      if (uses.weak) {
-        self.orderedDeps.add(uses.package);
-      }
+      self.deps.push({ package: packageName, weak, unordered });
     });
 
     self.useMeteorInstall =
@@ -1712,7 +1700,7 @@ export class PackageSourceBatch {
       imports: self.importedSymbolToPackageName,
       // XXX report an error if there is a package called global-imports
       includeSourceMapInstructions: isWeb,
-      orderedDeps: Array.from(self.orderedDeps)
+      deps: self.deps
     };
 
     const fileHashes = [];
diff --git a/tools/isobuild/linker.js b/tools/isobuild/linker.js
index 984ac94e9a..31d6ed990e 100644
--- a/tools/isobuild/linker.js
+++ b/tools/isobuild/linker.js
@@ -941,8 +941,12 @@ var getHeader = function (options) {
 
   var isApp = options.name === null;
   var chunks = [];
-   let orderedDeps = options.orderedDeps.map(packageName => {
-    return JSON.stringify(packageName);
+   let orderedDeps = [];
+
+  options.deps.forEach(dep => {
+    if (!dep.unordered) {
+      orderedDeps.push(JSON.stringify(dep.package))
+    }
   });
 
   chunks.push(
@@ -1136,9 +1140,9 @@ export var fullLink = Profile("linker.fullLink", async function (inputFiles, {
   // how to use them in a browser.
   includeSourceMapInstructions,
 
-  // List of packages this bundle directly uses that need to load
-  // first. Includes weak dependencies.
-  orderedDeps
+  // List of packages this bundle directly uses, or is implied by the packages
+  // it uses
+  deps
 }) {
   buildmessage.assertInJob();
 
@@ -1155,7 +1159,7 @@ export var fullLink = Profile("linker.fullLink", async function (inputFiles, {
   // we can be sure the runtime will be available
   // The main situations it is not available is the core-runtime
   // package itself, or any build plugins with no dependencies
-  let hasRuntime = orderedDeps.length > 0;
+  let hasRuntime = deps.some(entry => entry.unordered !== true);
 
   _.each(inputFiles, file => module.addFile(file));
 
@@ -1190,7 +1194,7 @@ export var fullLink = Profile("linker.fullLink", async function (inputFiles, {
         imports,
         packageVariables: [],
         hasRuntime,
-        orderedDeps
+        deps
       });
       let footer = getFooter({
         name: null,
@@ -1251,7 +1255,7 @@ export var fullLink = Profile("linker.fullLink", async function (inputFiles, {
     imports,
     packageVariables: _.union(assignedVariables, declaredExports),
     hasRuntime,
-    orderedDeps
+    deps
   });
 
   var footer = getFooter({