diff --git a/libdeflate-java-core/build.gradle.kts b/libdeflate-java-core/build.gradle.kts
index 671ba58..3b1c231 100644
--- a/libdeflate-java-core/build.gradle.kts
+++ b/libdeflate-java-core/build.gradle.kts
@@ -131,6 +131,7 @@ tasks.jar {
 
 spotless {
     cpp {
+        target("src/main/c/*")
         licenseHeaderFile(rootProject.file("license-header.txt"))
     }
 }
\ No newline at end of file