diff --git a/src/docs/changes/README.md b/src/docs/changes/README.md
index fbec6de81..bf38070dd 100644
--- a/src/docs/changes/README.md
+++ b/src/docs/changes/README.md
@@ -13,6 +13,10 @@
   Some public `List` parameters are also changed to `Set`.
 - Replace deprecated `SelfResolvingDependency` with `FileCollectionDependency`. ([#1114](https://github.com/GradleUp/shadow/pull/1114))
 
+**Fixed**
+
+- Fail builds if processing bad jars.  ([#1146](https://github.com/GradleUp/shadow/pull/1146))  
+
 
 ## [v9.0.0-beta4] (2024-12-06)
 
diff --git a/src/functionalTest/kotlin/com/github/jengelman/gradle/plugins/shadow/ShadowPluginTest.kt b/src/functionalTest/kotlin/com/github/jengelman/gradle/plugins/shadow/ShadowPluginTest.kt
index 46570901d..5283dfd58 100644
--- a/src/functionalTest/kotlin/com/github/jengelman/gradle/plugins/shadow/ShadowPluginTest.kt
+++ b/src/functionalTest/kotlin/com/github/jengelman/gradle/plugins/shadow/ShadowPluginTest.kt
@@ -1,5 +1,6 @@
 package com.github.jengelman.gradle.plugins.shadow
 
+import assertk.all
 import assertk.assertThat
 import assertk.assertions.contains
 import assertk.assertions.isEqualTo
@@ -18,6 +19,7 @@ import kotlin.io.path.readText
 import kotlin.io.path.writeText
 import org.gradle.api.plugins.JavaPlugin
 import org.gradle.testfixtures.ProjectBuilder
+import org.gradle.testkit.runner.TaskOutcome.FAILED
 import org.gradle.testkit.runner.TaskOutcome.SUCCESS
 import org.gradle.testkit.runner.TaskOutcome.UP_TO_DATE
 import org.junit.jupiter.api.Disabled
@@ -830,6 +832,33 @@ class ShadowPluginTest : BasePluginTest() {
     assertThat(result.output).contains("Reusing configuration cache.")
   }
 
+  @Issue(
+    "https://github.com/GradleUp/shadow/issues/915",
+  )
+  @Test
+  fun failBuildIfProcessingBadJar() {
+    val badJarPath = path("bad.jar").apply {
+      writeText("A bad jar.")
+    }.toUri().toURL().path
+
+    projectScriptPath.appendText(
+      """
+        dependencies {
+          implementation files('$badJarPath')
+        }
+      """.trimIndent(),
+    )
+
+    val result = runWithFailure(shadowJarTask)
+
+    assertThat(result).all {
+      taskOutcomeEquals(shadowJarTask, FAILED)
+      transform { it.output }.contains(
+        "java.util.zip.ZipException: archive is not a ZIP archive",
+      )
+    }
+  }
+
   private fun writeShadowedClientAndServerModules() {
     writeClientAndServerModules()
     path("client/build.gradle").appendText(
diff --git a/src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/tasks/ShadowCopyAction.kt b/src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/tasks/ShadowCopyAction.kt
index 82e09ad13..f9eb496b4 100644
--- a/src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/tasks/ShadowCopyAction.kt
+++ b/src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/tasks/ShadowCopyAction.kt
@@ -124,6 +124,8 @@ public open class ShadowCopyAction internal constructor(
             "See: ${documentationRegistry.getDslRefForProperty(Zip::class.java, "zip64")}",
         )
       }
+      // Rethrow the exception like `java.util.zip.ZipException: archive is not a ZIP archive`.
+      throw e
     }
     return WorkResults.didWork(true)
   }