diff --git a/semanticdb-gradle-plugin/src/main/scala/SemanticdbGradlePlugin.scala b/semanticdb-gradle-plugin/src/main/scala/SemanticdbGradlePlugin.scala
index 04e84ff5..b44e2c07 100644
--- a/semanticdb-gradle-plugin/src/main/scala/SemanticdbGradlePlugin.scala
+++ b/semanticdb-gradle-plugin/src/main/scala/SemanticdbGradlePlugin.scala
@@ -104,7 +104,7 @@ class SemanticdbGradlePlugin extends Plugin[Project] {
         project
           .getTasks()
           .withType(classOf[JavaCompile])
-          .all { task =>
+          .configureEach { task =>
             // If we run on JDK 17, we need to add special flags to the JVM
             // to allow access to the compiler.
 
diff --git a/tests/buildTools/src/test/scala/tests/GradleBuildToolSuite.scala b/tests/buildTools/src/test/scala/tests/GradleBuildToolSuite.scala
index 9eb470e1..9dc70e0d 100644
--- a/tests/buildTools/src/test/scala/tests/GradleBuildToolSuite.scala
+++ b/tests/buildTools/src/test/scala/tests/GradleBuildToolSuite.scala
@@ -511,4 +511,37 @@ abstract class GradleBuildToolSuite(gradle: Tool.Gradle)
     // NOTE(olafur): no packages because we use more modern APIs.
   )
 
+  // Regression test: projects that lazily register custom source sets (e.g. intTest)
+  // with a Java toolchain would fail because the eager `.all {}` API in the plugin
+  // caused the javaCompiler property to be finalized before Gradle finished
+  // configuring the task.
+  checkGradleBuild(
+    "lazy-sourceset-with-toolchain",
+    s"""|/build.gradle
+        |plugins {
+        |    id 'java'
+        |}
+        |java {
+        |  toolchain {
+        |    languageVersion = JavaLanguageVersion.of(11)
+        |  }
+        |}
+        |sourceSets {
+        |  intTest {
+        |    compileClasspath += sourceSets.main.output
+        |    runtimeClasspath += sourceSets.main.output
+        |  }
+        |}
+        |configurations {
+        |  intTestImplementation.extendsFrom implementation
+        |}
+        |/src/main/java/Example.java
+        |public class Example {}
+        |/src/intTest/java/ExampleIntTest.java
+        |public class ExampleIntTest {}
+        |""".stripMargin,
+    expectedSemanticdbFiles = 1,
+    gradleVersions = List(Gradle8, Gradle7)
+  )
+
 }