diff --git a/jython-reproducible-builds.patch b/jython-reproducible-builds.patch
new file mode 100644
index 0000000..452821b
--- /dev/null
+++ b/jython-reproducible-builds.patch
@@ -0,0 +1,43 @@
+diff --git a/build.xml b/build.xml
+index 52dfe71..0d41bdf 100644
+--- a/build.xml
++++ b/build.xml
+@@ -721,8 +721,12 @@ The text for an official release would continue like ...
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+@@ -1151,7 +1155,10 @@ The text for an official release would continue like ...
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+@@ -1175,7 +1182,10 @@ The text for an official release would continue like ...
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diff --git a/jython.spec b/jython.spec
index 0c2829c..1cd7f99 100644
--- a/jython.spec
+++ b/jython.spec
@@ -33,6 +33,7 @@ Patch1: %{name}-dont-validate-pom.patch
Patch2: %{name}-cachedir.patch
Patch3: %{name}-fix-tty-detection.patch
Patch4: %{name}-reproducible-now.patch
+Patch5: %{name}-reproducible-builds.patch
BuildRequires: ant
BuildRequires: ant-junit
BuildRequires: antlr3-java