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-rw-r--r--src/libmain/shared.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index df56a77cf832..e0e9328dd0ec 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -177,6 +177,9 @@ void switchToNixUser()
 {
 #if SETUID_HACK
 
+    /* Don't do anything if this is not a setuid binary. */
+    if (getuid() == geteuid()) return;
+
     /* Here we set the uid and gid to the Nix user and group,
        respectively, IF the current (real) user is a member of the Nix
        group.  Otherwise we just drop all privileges. */