diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 44582700a4..7665ea2bb6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -45,7 +45,16 @@ jobs:
           cache-read-only: ${{ github.ref != 'refs/heads/main' }}
 
       - name: Linter (gradle)
-        run: ./gradlew spotlessCheck :quartz:verifyKmpPurity :commons:verifyKmpPurity :commonsUI:verifyKmpPurity
+        # The three metadata compiles resolve commonMain against only the
+        # deps every target shares, which is the Apple classpath — a
+        # dependency that reaches JVM transitively (okio via OkHttp) but is
+        # missing for iOS fails here, on Linux, instead of in test-quartz-ios.
+        run: |
+          ./gradlew spotlessCheck \
+            :quartz:verifyKmpPurity :commons:verifyKmpPurity :commonsUI:verifyKmpPurity \
+            :quartz:compileCommonMainKotlinMetadata \
+            :commons:compileCommonMainKotlinMetadata \
+            :commonsUI:compileCommonMainKotlinMetadata
 
   build-desktop:
     needs: lint
diff --git a/commons/build.gradle.kts b/commons/build.gradle.kts
index 7e8b0dda6c..b952fe67af 100644
--- a/commons/build.gradle.kts
+++ b/commons/build.gradle.kts
@@ -83,6 +83,13 @@ kotlin {
                 // LruCache (KMP-ready)
                 implementation(libs.androidx.collection)
 
+                // okio (KMP, Apache-2.0) for service/image/DeferredDeleteFileSystem,
+                // the ForwardingFileSystem the apps wrap Coil's disk cache in. It
+                // used to arrive transitively through Coil; with Coil in
+                // :commonsUI the Apple targets lost it (JVM still saw it via
+                // OkHttp), so declare the dependency the file actually has.
+                implementation(libs.okio)
+
                 // Immutable collections
                 api(libs.kotlinx.collections.immutable)
 
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 266e447dd3..bde3c56b33 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -59,6 +59,7 @@ lightcompressor-enhanced = "2.2.1"
 jlatexmath = "1.5"
 markdown = "4d3b3dd173"
 highlights = "1.1.0"
+okio = "3.18.1"
 # JetBrains material3 must track Compose Multiplatform's foundation: CMP 1.12.0 changed
 # the CustomStyle.applyStyle signature, so the stable 1.9.0 (and the 1.11.0-alpha07 that
 # kodein-emoji pulls in) crash at runtime with AbstractMethodError in OutlinedTextField.
@@ -221,6 +222,7 @@ markdown-commonmark = { group = "com.github.vitorpamplona.compose-richtext", nam
 markdown-ui = { group = "com.github.vitorpamplona.compose-richtext", name = "richtext-ui", version.ref = "markdown" }
 markdown-ui-material3 = { group = "com.github.vitorpamplona.compose-richtext", name = "richtext-ui-material3", version.ref = "markdown" }
 highlights = { group = "dev.snipme", name = "highlights", version.ref = "highlights" }
+okio = { group = "com.squareup.okio", name = "okio", version.ref = "okio" }
 mockk = { group = "io.mockk", name = "mockk", version.ref = "mockk" }
 mockk-android = { group = "io.mockk", name = "mockk-android", version.ref = "mockk" }
 kotlinx-coroutines-test = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-test", version.ref = "kotlinx-coroutines-test"}