diff --git a/extra/dh_bash-completion b/extra/dh_bash-completion
index 804c5752..3cd6e5d5 100755
--- a/extra/dh_bash-completion
+++ b/extra/dh_bash-completion
@@ -93,7 +93,7 @@ foreach my $package (@{$dh{DOPACKAGES}}) {
 			}
 
 			foreach my $src (@filelist) {
-				doit("install", "-p", $src, "$bc_dir/$name");
+				doit("install", "-p", "-m644", $src, "$bc_dir/$name");
 			}
 		}
 	}