diff --git a/pkgs/applications/networking/pjsip/default.nix b/pkgs/applications/networking/pjsip/default.nix
index 1e067b3c335..8a66c039b5a 100644
--- a/pkgs/applications/networking/pjsip/default.nix
+++ b/pkgs/applications/networking/pjsip/default.nix
@@ -2,13 +2,15 @@
 
 stdenv.mkDerivation rec {
   name = "pjsip-${version}";
-  version = "2.8";
+  version = "2.9";
 
   src = fetchurl {
     url = "https://www.pjsip.org/release/${version}/pjproject-${version}.tar.bz2";
-    sha256 = "0ybg0113rp3fk49rm2v0pcgqb28h3dv1pdy9594w2ggiz7bhngah";
+    sha256 = "0dm6l8fypkimmzvld35zyykbg957cm5zb4ny3lchgv68amwfz1fi";
   };
 
+  patches = [ ./fix-aarch64.patch ];
+
   buildInputs = [ openssl libsamplerate alsaLib ];
 
   preConfigure = ''
diff --git a/pkgs/applications/networking/pjsip/fix-aarch64.patch b/pkgs/applications/networking/pjsip/fix-aarch64.patch
new file mode 100644
index 00000000000..f4aabf7a9bb
--- /dev/null
+++ b/pkgs/applications/networking/pjsip/fix-aarch64.patch
@@ -0,0 +1,13 @@
+--- a/aconfigure
++++ b/aconfigure
+@@ -8945,6 +8945,10 @@
+                                  ac_webrtc_instset=neon
+                                  ac_webrtc_cflags="-DWEBRTC_ARCH_ARMV7 -mfloat-abi=hard -mfpu=neon"
+                                  ;;
++                             arm64*|aarch64*)
++                                 ac_webrtc_instset=neon
++                                 ac_webrtc_cflags="-DWEBRTC_ARCH_ARM64"
++                                 ;;
+                              *)
+                                  ac_webrtc_instset=sse2
+                                  ;;