diff --git a/java-21-openjdk.changes b/java-21-openjdk.changes
index f83bb87..922e068 100644
--- a/java-21-openjdk.changes
+++ b/java-21-openjdk.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Thu Sep 21 11:14:41 UTC 2023 - Fridrich Strba <fstrba@suse.com>
+
+- Added patch:
+  * reproducible-properties.patch
+    + use SOURCE_DATE_EPOCH for timestamp in properties files if
+      it is set
+
 -------------------------------------------------------------------
 Tue Sep 19 10:46:38 UTC 2023 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/java-21-openjdk.spec b/java-21-openjdk.spec
index 1ca7dfc..9a06c9a 100644
--- a/java-21-openjdk.spec
+++ b/java-21-openjdk.spec
@@ -156,6 +156,7 @@ Patch5:         multiple-pkcs11-library-init.patch
 Patch8:         zero-ranges.patch
 # From icedtea: Increase default memory limits
 Patch10:        memory-limits.patch
+Patch11:        reproducible-properties.patch
 # Fix use of unintialized memory in adlc parser
 Patch12:        adlc-parser.patch
 # Fix: implicit-pointer-decl
@@ -394,6 +395,7 @@ rm -rvf src/java.desktop/share/native/liblcms/lcms2*
 %patch5 -p1
 %patch8 -p1
 %patch10 -p1
+%patch11 -p1
 %patch12 -p1
 %patch13 -p1
 
diff --git a/reproducible-properties.patch b/reproducible-properties.patch
new file mode 100644
index 0000000..e5eb718
--- /dev/null
+++ b/reproducible-properties.patch
@@ -0,0 +1,11 @@
+--- a/src/java.base/share/classes/java/util/Properties.java
++++ b/src/java.base/share/classes/java/util/Properties.java
+@@ -955,7 +955,7 @@ public class Properties extends Hashtable<Object,Object> {
+         if (sysPropVal != null && !sysPropVal.isEmpty()) {
+             writeComments(bw, sysPropVal);
+         } else {
+-            bw.write("#" + new Date());
++            bw.write("#" + (System.getenv("SOURCE_DATE_EPOCH") != null ? new Date(1000 * Long.parseLong(System.getenv("SOURCE_DATE_EPOCH"))) : new Date()));
+             bw.newLine();
+         }
+     }