diff --git a/helpers/setuid/setuid-wrapper.c b/helpers/setuid/setuid-wrapper.c
index 30452fc7b7b8..32965d40c113 100644
--- a/helpers/setuid/setuid-wrapper.c
+++ b/helpers/setuid/setuid-wrapper.c
@@ -63,6 +63,7 @@ int main(int argc, char * * argv)
     len = read(fdSelf, real, PATH_MAX);
     assert (len != -1);
     assert (len < sizeof (real));
+    assert (len > 0);
     real[len] = 0;
 
     close(fdSelf);