diff --git a/core/src/main/java/hudson/util/jna/GNUCLibrary.java b/core/src/main/java/hudson/util/jna/GNUCLibrary.java
index f622df94c2af7dcbf7fe1f6c1540956f22487930..2c8a35f45740d339839b514548eb4ba2c6084819 100644
--- a/core/src/main/java/hudson/util/jna/GNUCLibrary.java
+++ b/core/src/main/java/hudson/util/jna/GNUCLibrary.java
@@ -40,6 +40,7 @@ public interface GNUCLibrary extends Library {
     int setsid();
     int umask(int mask);
     int getpid();
+    int geteuid();
     int getppid();
     int chdir(String dir);
     int execv(String file, StringArray args);