diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5e2a7d34..43d28657 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [  windows-latest, macos-latest ] # ubuntu-latest, ]
     steps:
       - name: Checkout
         uses: actions/checkout@v2.3.3
diff --git a/ktoml-core/build.gradle.kts b/ktoml-core/build.gradle.kts
index 112e1f46..410e1643 100644
--- a/ktoml-core/build.gradle.kts
+++ b/ktoml-core/build.gradle.kts
@@ -16,9 +16,15 @@ kotlin {
             }
         }
     }
-    linuxX64()
-    mingwX64()
-    macosX64()
+
+    val os = org.gradle.nativeplatform.platform.internal.DefaultNativePlatform.getCurrentOperatingSystem()
+    // Create a target for the host platform.
+    when {
+        os.isLinux -> linuxX64()
+        os.isWindows -> mingwX64()
+        os.isMacOsX -> macosX64()
+        else -> throw GradleException("Host OS '${os.name}' is not supported in Kotlin/Native $project.")
+    }
 
     sourceSets {
         val commonMain by getting {