diff --git a/build.gradle b/build.gradle
index 3f400c41..92a8e603 100644
--- a/build.gradle
+++ b/build.gradle
@@ -129,7 +129,7 @@ openapiProcessor {
         processor 'io.openapiprocessor:openapi-processor-spring:2022.5'
         apiPath "$projectDir/src/main/resources/api-definition/api-definition.yaml"
         mapping "$projectDir/src/main/resources/api-definition/api-mappings.yaml"
-        targetDir "$buildDir/generated/sources/openapi-javax"
+        targetDir layout.buildDirectory.dir("generated/sources/openapi-javax")
         showWarnings true
         openApiNullable true
     }
@@ -138,7 +138,7 @@ openapiProcessor {
         processor 'io.openapiprocessor:openapi-processor-spring:2022.5'
         apiPath "$projectDir/src/main/resources/api-definition/rbac/rbac.yaml"
         mapping "$projectDir/src/main/resources/api-definition/rbac/api-mappings.yaml"
-        targetDir "$buildDir/generated/sources/openapi-javax"
+        targetDir layout.buildDirectory.dir("generated/sources/openapi-javax")
         showWarnings true
         openApiNullable true
     }
@@ -147,7 +147,7 @@ openapiProcessor {
         processor 'io.openapiprocessor:openapi-processor-spring:2022.5'
         apiPath "$projectDir/src/main/resources/api-definition/test/test.yaml"
         mapping "$projectDir/src/main/resources/api-definition/test/api-mappings.yaml"
-        targetDir "$buildDir/generated/sources/openapi-javax"
+        targetDir layout.buildDirectory.dir("generated/sources/openapi-javax")
         showWarnings true
         openApiNullable true
     }
@@ -156,7 +156,7 @@ openapiProcessor {
         processor 'io.openapiprocessor:openapi-processor-spring:2022.5'
         apiPath "$projectDir/src/main/resources/api-definition/hs-office/hs-office.yaml"
         mapping "$projectDir/src/main/resources/api-definition/hs-office/api-mappings.yaml"
-        targetDir "$buildDir/generated/sources/openapi-javax"
+        targetDir layout.buildDirectory.dir("generated/sources/openapi-javax")
         showWarnings true
         openApiNullable true
     }
@@ -165,7 +165,7 @@ openapiProcessor {
         processor 'io.openapiprocessor:openapi-processor-spring:2022.5'
         apiPath "$projectDir/src/main/resources/api-definition/hs-booking/hs-booking.yaml"
         mapping "$projectDir/src/main/resources/api-definition/hs-booking/api-mappings.yaml"
-        targetDir "$buildDir/generated/sources/openapi-javax"
+        targetDir layout.buildDirectory.dir("generated/sources/openapi-javax")
         showWarnings true
         openApiNullable true
     }
@@ -174,7 +174,7 @@ openapiProcessor {
         processor 'io.openapiprocessor:openapi-processor-spring:2022.5'
         apiPath "$projectDir/src/main/resources/api-definition/hs-hosting/hs-hosting.yaml"
         mapping "$projectDir/src/main/resources/api-definition/hs-hosting/api-mappings.yaml"
-        targetDir "$buildDir/generated/sources/openapi-javax"
+        targetDir layout.buildDirectory.dir("generated/sources/openapi-javax")
         showWarnings true
         openApiNullable true
     }
@@ -201,11 +201,11 @@ project.tasks.compileJava.dependsOn processSpring
 // TODO.impl: Upgrade to io.openapiprocessor.openapi-processor >= 2024.2
 //  and use either `bean-validation: true` in api-mapping.yaml or `useSpringBoot3 true` (not sure where exactly).
 task openApiGenerate(type: Copy) {
-    from "$buildDir/generated/sources/openapi-javax"
-    into "$buildDir/generated/sources/openapi"
+    from layout.buildDirectory.dir("generated/sources/openapi-javax")
+    into layout.buildDirectory.dir("generated/sources/openapi")
     filter { line -> line.replaceAll('javax', 'jakarta') }
 }
-compileJava.source "$buildDir/generated/sources/openapi"
+compileJava.source layout.buildDirectory.dir("generated/sources/openapi")
 compileJava.dependsOn openApiGenerate
 openApiGenerate.dependsOn processSpring