diff --git a/srcpkgs/babeld/patches/45.patch b/srcpkgs/babeld/patches/45.patch
new file mode 100644
index 00000000000..089e35f8d54
--- /dev/null
+++ b/srcpkgs/babeld/patches/45.patch
@@ -0,0 +1,71 @@
+From 36121c1e67fb5a60a35fed0faa37297cd97c9ffc Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Fabian=20Bl=C3=A4se?= <fabian@blaese.de>
+Date: Thu, 19 Sep 2019 01:16:46 +0200
+Subject: [PATCH] Remove src_plen assignments which break v4mapped encoding
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+These assignments were introduced in f8bce04, probably
+to ensure that src_plen doesn't contain any leftovers from
+earlier revisions when source specific wasn't done via sub-TLVs.
+
+This however breaks v4mapped encoding as a prefix length of 0
+for IPv4 routes is represented as src_plen = 96. This offset is
+already added outside of the affected functions and therefore
+gets overwritten by this assignment.
+
+Both functions contain an additional check if the message contains
+ipv4 addresses, but as this check is only executed if the message has
+a source-specific sub-TLV, the offset isn't added for non source-specific
+routes.
+
+Because the offset is already added outside of the subtlv parsing
+functions, this additional check is also removed, as it would otherwise
+break IPv4 source specifics by adding the IPv4 offset two times.
+
+Signed-off-by: Fabian Bläse <fabian@blaese.de>
+---
+ message.c | 8 --------
+ 1 file changed, 8 deletions(-)
+
+diff --git a/message.c b/message.c
+index 0f6ca19d..78f9aa93 100644
+--- a/message.c
++++ b/message.c
+@@ -137,8 +137,6 @@ parse_update_subtlv(struct interface *ifp, int metric, int ae,
+         }
+     }
+ 
+-    *src_plen = 0;
+-
+     while(i < alen) {
+         type = a[i];
+         if(type == SUBTLV_PAD1) {
+@@ -170,8 +168,6 @@ parse_update_subtlv(struct interface *ifp, int metric, int ae,
+                                 len - 1, src_prefix);
+             if(rc < 0)
+                 goto fail;
+-            if(ae == 1)
+-                (*src_plen) += 96;
+         } else {
+             debugf("Received unknown%s Update sub-TLV %d.\n",
+                    (type & 0x80) != 0 ? " mandatory" : "", type);
+@@ -305,8 +301,6 @@ parse_request_subtlv(int ae, const unsigned char *a, int alen,
+ {
+     int type, len, i = 0;
+ 
+-    *src_plen = 0;
+-
+     while(i < alen) {
+         type = a[0];
+         if(type == SUBTLV_PAD1) {
+@@ -336,8 +330,6 @@ parse_request_subtlv(int ae, const unsigned char *a, int alen,
+                                 len - 1, src_prefix);
+             if(rc < 0)
+                 goto fail;
+-            if(ae == 1)
+-                (*src_plen) += 96;
+         } else {
+             debugf("Received unknown%s Route Request sub-TLV %d.\n",
+                    ((type & 0x80) != 0) ? " mandatory" : "", type);
diff --git a/srcpkgs/babeld/template b/srcpkgs/babeld/template
index c5dc9a305cb..3cc10656aad 100644
--- a/srcpkgs/babeld/template
+++ b/srcpkgs/babeld/template
@@ -1,7 +1,7 @@
 # Template file for 'babeld'
 pkgname=babeld
 version=1.9.1
-revision=1
+revision=2
 wrksrc=babeld-babeld-${version}
 build_style=gnu-makefile
 short_desc="Babel loop-avoiding distance-vector routing daemon"
@@ -10,6 +10,7 @@ license="MIT"
 homepage="https://www.irif.fr/~jch/software/babel/"
 distfiles="https://github.com/jech/babeld/archive/babeld-${version}.tar.gz"
 checksum=16e18dbd9f8442feaa68487f5919a8ff8f7d95c62a9c7a3c42b7adf31bd4a9b3
+patch_args="-Np1"
 
 do_install() {
 	vbin babeld