diff --git a/lib/installer.js b/lib/installer.js
index 5cf9a83..75891d6 100644
--- a/lib/installer.js
+++ b/lib/installer.js
@@ -163,6 +163,7 @@ class DotnetCoreInstaller {
             // cache tool
             console.log('Caching tool');
             let cachedDir = yield tc.cacheDir(extPath, this.cachedToolName, this.version, this.arch);
+            core.exportVariable('DOTNET_ROOT', cachedDir);
             console.log('Successfully installed', this.version);
             return cachedDir;
         });
diff --git a/src/installer.ts b/src/installer.ts
index 7016be9..7c975fd 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -171,6 +171,10 @@ export class DotnetCoreInstaller {
       this.version,
       this.arch
     );
+
+    // Need to set this so that .NET Core global tools find the right locations.
+    core.exportVariable('DOTNET_ROOT', cachedDir);
+
     console.log('Successfully installed', this.version);
     return cachedDir;
   }