diff --git a/install/linux/build-rpm.py b/install/linux/build-rpm.py
index a1ad25c..1421ec1 100755
--- a/install/linux/build-rpm.py
+++ b/install/linux/build-rpm.py
@@ -59,8 +59,7 @@ def build(qubes=False):
     shutil.copy2(specfile_path, build_dir / "SPECS")
     rpm_dir = build_dir / "RPMS" / "x86_64"
     srpm_dir = build_dir / "SRPMS"
-    if srpm_dir.exists():
-        os.unlink(srpm_dir)
+    srpm_dir.unlink(missing_ok=True)
     os.symlink(dist_path, rpm_dir)
     os.symlink(dist_path, srpm_dir)
 
diff --git a/install/linux/dangerzone.spec b/install/linux/dangerzone.spec
index d24092c..99886e0 100644
--- a/install/linux/dangerzone.spec
+++ b/install/linux/dangerzone.spec
@@ -268,7 +268,7 @@ install -m 644 share/* %{buildroot}/usr/share/dangerzone
 # /etc/qubes-rpc.
 %if 0%{?_qubes}
 install -m 755 -d %{buildroot}/etc/qubes-rpc
-install -m 644 qubes/* %{buildroot}/etc/qubes-rpc
+install -m 755 qubes/* %{buildroot}/etc/qubes-rpc
 %endif
 
 # The following files are included in the top level of the Python source
diff --git a/qubes/dz.ConvertDev b/qubes/dz.ConvertDev
index a663081..cb93b79 100755
--- a/qubes/dz.ConvertDev
+++ b/qubes/dz.ConvertDev
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import asyncio
 import glob