diff --git a/src/support/NodeModules.ts b/src/support/NodeModules.ts
index f58ce6d..83489c1 100644
--- a/src/support/NodeModules.ts
+++ b/src/support/NodeModules.ts
@@ -73,9 +73,10 @@ export class NodeModules {
      *
      * @param root - the path to node_modules
      * @param module - the module whose children we are discovering
+     * @param seen - used to prevent duplicate packages when recursing
      * @protected
      */
-    protected async discoverRoot(root: UniversalPath, module: NodeModule): Promise<void> {
+    protected async discoverRoot(root: UniversalPath, module: NodeModule, seen: string[] = []): Promise<void> {
         for ( const key in module.dependencies ) {
             if ( !Object.prototype.hasOwnProperty.call(module.dependencies, key) ) {
                 continue
@@ -94,13 +95,19 @@ export class NodeModules {
                         continue
                     }
 
+                    if ( seen.includes(key) ) {
+                        this.logging.debug(`Skipping already-discovered package: ${key}`)
+                        continue
+                    }
+
                     this.logging.info(`Auto-discovering package: ${key}`)
+                    seen.push(key)
                     await this.bus.dispatch(new PackageDiscovered(packageJsonData, packageJson.clone()))
 
                     const packageNodeModules = packageJson.concat('..', 'node_modules')
                     if ( await packageNodeModules.exists() && packageJsonData?.extollo?.recursiveDependencies?.discover ) {
                         this.logging.debug(`Recursing: ${packageNodeModules}`)
-                        await this.discoverRoot(packageNodeModules, packageJsonData)
+                        await this.discoverRoot(packageNodeModules, packageJsonData, seen)
                     }
                 }
             } catch (e: unknown) {