diff --git a/master.inc b/master.inc
index eee0436..92a496e 100644
--- a/master.inc
+++ b/master.inc
@@ -101,7 +101,9 @@ rm -rf kernel-tfg/
 make olddefconfig
 
 # diff for viewing later :)
-[ -f .config.old ] && diff .config .config.old
+if [ -f .config.old ]; then
+    diff .config .config.old
+fi
 
 %build
 %{make} %{?_smp_mflags} PYTHON=%{__python3} %{make_targets}