diff --git a/lector.spec b/lector.spec
index 757b1b0..7616a2f 100644
--- a/lector.spec
+++ b/lector.spec
@@ -56,6 +56,17 @@ It supports the following file formats:
 
 %prep
 %autosetup -n Lector-%{version}
+# These files contain a Python shebang, but seem to get installed by upstream's setup.py without an executability bit set, so there's a mismatch in whether it's supposed to be executable...
+chmod -x ./lector/KindleUnpack/compatibility_utils.py
+chmod -x ./lector/KindleUnpack/mobi_split.py
+chmod -x ./lector/KindleUnpack/unipath.py
+chmod -x ./lector/__main__.py
+chmod -x ./lector/rarfile/dumprar.py
+# Non-executable Python files don't need a shebang line.
+find ./  -type f  -iname "*.py"  '!' -executable  -exec sed --regexp-extended 's|^#! */usr/bin/env python[[:digit:]._-]*$||g'  --in-place '{}' ';'
+# For executable Python files, don't use env python.
+find ./  -type f  -iname "*.py"  -executable  -exec sed --regexp-extended 's|^#! */usr/bin/env python[[:digit:]._-]*$|#!%{__python3}|g'  --in-place '{}' ';'
+
 
 
 %build