diff --git a/build-tools-internal/build.gradle b/build-tools-internal/build.gradle
index bd93c63d3cea..9f7fc0c3ff83 100644
--- a/build-tools-internal/build.gradle
+++ b/build-tools-internal/build.gradle
@@ -165,9 +165,9 @@ if (JavaVersion.current() < JavaVersion.VERSION_11) {
   throw new GradleException('At least Java 11 is required to build elasticsearch gradle tools')
 }
 
-def minRuntimeJava = JavaVersion.toVersion(file('src/main/resources/minimumRuntimeVersion').text)
-targetCompatibility = minRuntimeJava
-sourceCompatibility = minRuntimeJava
+def minCompilerJava = JavaVersion.toVersion(file('src/main/resources/minimumCompilerVersion').text)
+targetCompatibility = minCompilerJava
+sourceCompatibility = minCompilerJava
 
 sourceSets {
   integTest {
@@ -267,4 +267,4 @@ tasks.register("integTest", Test) {
   useJUnitPlatform()
 }
 
-tasks.named("check").configure { dependsOn("integTest") }
\ No newline at end of file
+tasks.named("check").configure { dependsOn("integTest") }