diff --git a/package/trousers/0004-openssl4.patch b/package/trousers/0004-openssl4.patch
new file mode 100644
index 0000000000..5ef6cb19b0
--- /dev/null
+++ b/package/trousers/0004-openssl4.patch
@@ -0,0 +1,26 @@
+Description: Fix for OpenSSL4 compatibility
+ Replace direct access to opaque ASN1_OCTET_STRING->data field with
+ ASN1_STRING_get0_data() accessor. ASN1_STRING is fully opaque in OpenSSL 4.0.
+Author: Ravi Kant Sharma <ravi.kant.sharma@canonical.com>
+Bug-Ubuntu: https://bugs.launchpad.net/bugs/2155003
+Bug-Debian: https://bugs.debian.org/1138451
+Forwarded: no
+
+Patch downloaded from Debian:
+https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1138451#12
+
+Upstream: https://sourceforge.net/p/trousers/bugs/240/
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+
+--- a/src/tspi/tspi_asn1.c
++++ b/src/tspi/tspi_asn1.c
+@@ -237,7 +237,7 @@
+ 
+ 	if (*rawBlobSize != 0) {
+ 		if (decBlobSize <= *rawBlobSize) {
+-			memcpy(rawBlob, tssBlob->blob->data, decBlobSize);
++			memcpy(rawBlob, ASN1_STRING_get0_data(tssBlob->blob), decBlobSize);
+ 		}
+ 		else {
+ 			TSS_BLOB_free(tssBlob);