diff --git a/coil-core/src/commonTest/kotlin/coil3/memory/StrongMemoryCacheTest.kt b/coil-core/src/commonTest/kotlin/coil3/memory/StrongMemoryCacheTest.kt
index ba9aa3bf79..363a16a2e0 100644
--- a/coil-core/src/commonTest/kotlin/coil3/memory/StrongMemoryCacheTest.kt
+++ b/coil-core/src/commonTest/kotlin/coil3/memory/StrongMemoryCacheTest.kt
@@ -3,7 +3,6 @@ package coil3.memory
 import coil3.Image
 import coil3.memory.MemoryCache.Key
 import coil3.memory.MemoryCache.Value
-import coil3.test.utils.DEFAULT_FAKE_IMAGE_SIZE
 import coil3.test.utils.FakeImage
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -15,7 +14,7 @@ class StrongMemoryCacheTest {
     @Test
     fun canRetrieveCachedValue() {
         val weakCache = FakeWeakMemoryCache()
-        val strongCache = RealStrongMemoryCache(2 * DEFAULT_FAKE_IMAGE_SIZE, weakCache)
+        val strongCache = RealStrongMemoryCache(2 * FakeImage().size, weakCache)
 
         val image = FakeImage()
         strongCache.set(Key("1"), image, emptyMap(), image.size)
@@ -26,7 +25,7 @@ class StrongMemoryCacheTest {
     @Test
     fun leastRecentlyUsedValueIsEvicted() {
         val weakCache = FakeWeakMemoryCache()
-        val strongCache = RealStrongMemoryCache(2 * DEFAULT_FAKE_IMAGE_SIZE, weakCache)
+        val strongCache = RealStrongMemoryCache(2 * FakeImage().size, weakCache)
 
         val first = FakeImage()
         strongCache.set(Key("1"), first, emptyMap(), first.size)
@@ -44,7 +43,7 @@ class StrongMemoryCacheTest {
     @Test
     fun valueCanBeRemoved() {
         val weakCache = FakeWeakMemoryCache()
-        val strongCache = RealStrongMemoryCache(2 * DEFAULT_FAKE_IMAGE_SIZE, weakCache)
+        val strongCache = RealStrongMemoryCache(2 * FakeImage().size, weakCache)
 
         val image = FakeImage()
         strongCache.set(Key("1"), image, emptyMap(), image.size)
diff --git a/coil-test/src/commonTest/kotlin/coil3/test/FakeImageLoaderEngineTest.kt b/coil-test/src/commonTest/kotlin/coil3/test/FakeImageLoaderEngineTest.kt
index aa0a1aa47c..4d7c97b558 100644
--- a/coil-test/src/commonTest/kotlin/coil3/test/FakeImageLoaderEngineTest.kt
+++ b/coil-test/src/commonTest/kotlin/coil3/test/FakeImageLoaderEngineTest.kt
@@ -6,7 +6,6 @@ import coil3.request.ErrorResult
 import coil3.request.ImageRequest
 import coil3.request.SuccessResult
 import coil3.test.FakeImageLoaderEngine.OptionalInterceptor
-import coil3.test.utils.FakeImage
 import coil3.test.utils.RobolectricTest
 import coil3.test.utils.context
 import kotlin.test.Test
diff --git a/internal/test-utils/build.gradle.kts b/internal/test-utils/build.gradle.kts
index 528f3cdad1..bda7ddc94a 100644
--- a/internal/test-utils/build.gradle.kts
+++ b/internal/test-utils/build.gradle.kts
@@ -5,6 +5,7 @@ plugins {
     id("com.android.library")
     id("kotlin-multiplatform")
     id("org.jetbrains.kotlinx.atomicfu")
+    id("dev.drewhamilton.poko")
 }
 
 addAllMultiplatformTargets(libs.versions.skiko)
diff --git a/internal/test-utils/src/androidMain/kotlin/coil3/test/utils/FakeImage.android.kt b/internal/test-utils/src/androidMain/kotlin/coil3/test/utils/FakeImage.android.kt
deleted file mode 100644
index 43c7502aa6..0000000000
--- a/internal/test-utils/src/androidMain/kotlin/coil3/test/utils/FakeImage.android.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package coil3.test.utils
-
-import coil3.Canvas
-import coil3.Image
-import coil3.annotation.Poko
-
-@Poko
-actual class FakeImage actual constructor(
-    actual override val width: Int,
-    actual override val height: Int,
-    actual override val size: Long,
-    actual override val shareable: Boolean,
-) : Image {
-    actual override fun draw(canvas: Canvas) {
-        // Draw nothing.
-    }
-}
diff --git a/internal/test-utils/src/commonMain/kotlin/coil3/test/utils/FakeImage.kt b/internal/test-utils/src/commonMain/kotlin/coil3/test/utils/FakeImage.kt
index ea335c9f36..00118fc90e 100644
--- a/internal/test-utils/src/commonMain/kotlin/coil3/test/utils/FakeImage.kt
+++ b/internal/test-utils/src/commonMain/kotlin/coil3/test/utils/FakeImage.kt
@@ -2,18 +2,17 @@ package coil3.test.utils
 
 import coil3.Canvas
 import coil3.Image
+import coil3.annotation.Poko
 
-expect class FakeImage(
-    width: Int = 100,
-    height: Int = 100,
-    size: Long = 4L * width * height,
-    shareable: Boolean = true,
+/** An [Image] that renders nothing. */
+@Poko
+class FakeImage(
+    override val width: Int = 100,
+    override val height: Int = 100,
+    override val size: Long = 4L * width * height,
+    override val shareable: Boolean = true,
 ) : Image {
-    override val size: Long
-    override val width: Int
-    override val height: Int
-    override val shareable: Boolean
-    override fun draw(canvas: Canvas)
+    override fun draw(canvas: Canvas) {
+        // Draw nothing.
+    }
 }
-
-const val DEFAULT_FAKE_IMAGE_SIZE = 4L * 100 * 100
diff --git a/internal/test-utils/src/nonAndroidMain/kotlin/coil3/test/utils/FakeImage.nonAndroid.kt b/internal/test-utils/src/nonAndroidMain/kotlin/coil3/test/utils/FakeImage.nonAndroid.kt
deleted file mode 100644
index 43c7502aa6..0000000000
--- a/internal/test-utils/src/nonAndroidMain/kotlin/coil3/test/utils/FakeImage.nonAndroid.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package coil3.test.utils
-
-import coil3.Canvas
-import coil3.Image
-import coil3.annotation.Poko
-
-@Poko
-actual class FakeImage actual constructor(
-    actual override val width: Int,
-    actual override val height: Int,
-    actual override val size: Long,
-    actual override val shareable: Boolean,
-) : Image {
-    actual override fun draw(canvas: Canvas) {
-        // Draw nothing.
-    }
-}