diff --git a/brp-fix-pyc-reproducibility b/brp-fix-pyc-reproducibility
new file mode 100644
index 0000000..4118d97
--- /dev/null
+++ b/brp-fix-pyc-reproducibility
@@ -0,0 +1,18 @@
+#!/bin/bash -e
+
+# If using normal root, avoid changing anything.
+if [ -z "$RPM_BUILD_ROOT" -o "$RPM_BUILD_ROOT" = "/" ]; then
+  exit 0
+fi
+
+# Defined as %py_reproducible_pyc_path macro and passed here as
+# the first command-line argument
+path_to_fix=$1
+
+# First, check that the parser is available:
+if [ ! -x /usr/bin/marshalparser ]; then
+  echo "ERROR: If %py_reproducible_pyc_path is defined, you have to also BuildRequire: /usr/bin/marshalparser !"
+  exit 1
+fi
+
+find "$path_to_fix" -type f -name "*.pyc" | xargs /usr/bin/marshalparser --fix --overwrite