diff --git a/buildSrc/src/test/java/org/springframework/boot/build/ConventionsPluginTests.java b/buildSrc/src/test/java/org/springframework/boot/build/ConventionsPluginTests.java
index 01573099767..300ce0a0c50 100644
--- a/buildSrc/src/test/java/org/springframework/boot/build/ConventionsPluginTests.java
+++ b/buildSrc/src/test/java/org/springframework/boot/build/ConventionsPluginTests.java
@@ -76,7 +76,9 @@ class ConventionsPluginTests {
 			out.println("    id 'org.springframework.boot.conventions'");
 			out.println("}");
 			out.println("version = '1.2.3'");
-			out.println("sourceCompatibility = '17'");
+			out.println("java {");
+			out.println("    sourceCompatibility = '17'");
+			out.println("}");
 			out.println("description 'Test project for manifest customization'");
 			out.println("jar.archiveFileName = 'test.jar'");
 		}
@@ -106,7 +108,9 @@ class ConventionsPluginTests {
 			out.println("    id 'org.springframework.boot.conventions'");
 			out.println("}");
 			out.println("version = '1.2.3'");
-			out.println("sourceCompatibility = '17'");
+			out.println("java {");
+			out.println("    sourceCompatibility = '17'");
+			out.println("}");
 			out.println("description 'Test'");
 		}
 		runGradle("assemble");
@@ -135,7 +139,9 @@ class ConventionsPluginTests {
 			out.println("    id 'org.springframework.boot.conventions'");
 			out.println("}");
 			out.println("version = '1.2.3'");
-			out.println("sourceCompatibility = '17'");
+			out.println("java {");
+			out.println("    sourceCompatibility = '17'");
+			out.println("}");
 			out.println("description 'Test'");
 		}
 		runGradle("assemble");