diff --git a/mosaic-runtime/build.gradle b/mosaic-runtime/build.gradle
index 28773944..cf22a600 100644
--- a/mosaic-runtime/build.gradle
+++ b/mosaic-runtime/build.gradle
@@ -1,4 +1,5 @@
 import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinMetadataTarget
 
 apply plugin: 'org.jetbrains.kotlin.multiplatform'
 apply from: "$rootDir/addAllTargets.gradle"
@@ -37,11 +38,12 @@ kotlin {
 	}
 
 	targets.each { target ->
+		if (target instanceof KotlinMetadataTarget) return
 		if (target.platformType != KotlinPlatformType.jvm) {
-			target.compilations.main.source(sourceSets.nonJvmMain)
+			target.compilations.main.defaultSourceSet.dependsOn(sourceSets.nonJvmMain)
 		}
 		if (target.platformType == KotlinPlatformType.native) {
-			target.compilations.main.source(sourceSets.concurrentMain)
+			target.compilations.main.defaultSourceSet.dependsOn(sourceSets.concurrentMain)
 		}
 	}
 }
diff --git a/mosaic-runtime/src/concurrentMain/kotlin/com/jakewharton/mosaic/blocking.kt b/mosaic-runtime/src/concurrentMain/kotlin/com/jakewharton/mosaic/blocking.kt
index 3d1aa9ab..3cd91620 100644
--- a/mosaic-runtime/src/concurrentMain/kotlin/com/jakewharton/mosaic/blocking.kt
+++ b/mosaic-runtime/src/concurrentMain/kotlin/com/jakewharton/mosaic/blocking.kt
@@ -1,3 +1,9 @@
 package com.jakewharton.mosaic
 
-expect fun runMosaicBlocking(body: suspend MosaicScope.() -> Unit)
+import kotlinx.coroutines.runBlocking
+
+fun runMosaicBlocking(body: suspend MosaicScope.() -> Unit) {
+	runBlocking {
+		runMosaic(body)
+	}
+}
diff --git a/mosaic-runtime/src/jvmMain/kotlin/com/jakewharton/mosaic/blocking.kt b/mosaic-runtime/src/jvmMain/kotlin/com/jakewharton/mosaic/blocking.kt
deleted file mode 100644
index 3f477c67..00000000
--- a/mosaic-runtime/src/jvmMain/kotlin/com/jakewharton/mosaic/blocking.kt
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.jakewharton.mosaic
-
-import kotlinx.coroutines.runBlocking
-
-actual fun runMosaicBlocking(body: suspend MosaicScope.() -> Unit) {
-	runBlocking {
-		runMosaic(body)
-	}
-}
diff --git a/mosaic-runtime/src/linuxX64Main/kotlin/com/jakewharton/mosaic/blocking.kt b/mosaic-runtime/src/linuxX64Main/kotlin/com/jakewharton/mosaic/blocking.kt
deleted file mode 100644
index 3f477c67..00000000
--- a/mosaic-runtime/src/linuxX64Main/kotlin/com/jakewharton/mosaic/blocking.kt
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.jakewharton.mosaic
-
-import kotlinx.coroutines.runBlocking
-
-actual fun runMosaicBlocking(body: suspend MosaicScope.() -> Unit) {
-	runBlocking {
-		runMosaic(body)
-	}
-}
diff --git a/mosaic-runtime/src/macosArm64Main/kotlin/com/jakewharton/mosaic/blocking.kt b/mosaic-runtime/src/macosArm64Main/kotlin/com/jakewharton/mosaic/blocking.kt
deleted file mode 100644
index 3f477c67..00000000
--- a/mosaic-runtime/src/macosArm64Main/kotlin/com/jakewharton/mosaic/blocking.kt
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.jakewharton.mosaic
-
-import kotlinx.coroutines.runBlocking
-
-actual fun runMosaicBlocking(body: suspend MosaicScope.() -> Unit) {
-	runBlocking {
-		runMosaic(body)
-	}
-}
diff --git a/mosaic-runtime/src/macosX64Main/kotlin/com/jakewharton/mosaic/blocking.kt b/mosaic-runtime/src/macosX64Main/kotlin/com/jakewharton/mosaic/blocking.kt
deleted file mode 100644
index 3f477c67..00000000
--- a/mosaic-runtime/src/macosX64Main/kotlin/com/jakewharton/mosaic/blocking.kt
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.jakewharton.mosaic
-
-import kotlinx.coroutines.runBlocking
-
-actual fun runMosaicBlocking(body: suspend MosaicScope.() -> Unit) {
-	runBlocking {
-		runMosaic(body)
-	}
-}
diff --git a/mosaic-runtime/src/mingwX64Main/kotlin/com/jakewharton/mosaic/blocking.kt b/mosaic-runtime/src/mingwX64Main/kotlin/com/jakewharton/mosaic/blocking.kt
deleted file mode 100644
index 3f477c67..00000000
--- a/mosaic-runtime/src/mingwX64Main/kotlin/com/jakewharton/mosaic/blocking.kt
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.jakewharton.mosaic
-
-import kotlinx.coroutines.runBlocking
-
-actual fun runMosaicBlocking(body: suspend MosaicScope.() -> Unit) {
-	runBlocking {
-		runMosaic(body)
-	}
-}