diff --git a/rust-afterburn.spec b/rust-afterburn.spec
index 89acc6a..dc6ec54 100644
--- a/rust-afterburn.spec
+++ b/rust-afterburn.spec
@@ -110,6 +110,8 @@ to run in the initramfs on boot.
 %autosetup -n %{crate}-%{version_no_tilde} -p1 %{?rhel:-a1}
 %if 0%{?rhel}
 %cargo_prep -v vendor
+# avoid brp-mangle-shebangs error from sources with executable bit            
+chmod -x vendor/ipnet/src/*.rs
 %else
 %cargo_prep
 %endif