diff --git a/reproducible.patch b/reproducible.patch
new file mode 100644
index 0000000..677c3eb
--- /dev/null
+++ b/reproducible.patch
@@ -0,0 +1,13 @@
+Index: pgmagick-0.7.4/setup.py
+===================================================================
+--- pgmagick-0.7.4.orig/setup.py
++++ pgmagick-0.7.4/setup.py
+@@ -218,7 +218,7 @@ setup(name='pgmagick',
+       packages=find_packages(),
+       ext_modules=[
+           Extension('pgmagick._pgmagick',
+-                    sources=glob.glob('./src/*.cpp'),
++                    sources=sorted(glob.glob('./src/*.cpp')),
+                     include_dirs=include_dirs,
+                     library_dirs=library_dirs,
+                     libraries=libraries,