diff --git a/pkgs/tools/audio/trx/add_bctoolbox_ldlib.patch b/pkgs/tools/audio/trx/add_bctoolbox_ldlib.patch
new file mode 100644
index 00000000000..1854a43a249
--- /dev/null
+++ b/pkgs/tools/audio/trx/add_bctoolbox_ldlib.patch
@@ -0,0 +1,15 @@
+diff --git a/Makefile b/Makefile
+index ffcd883..c4b4ff7 100644
+--- a/Makefile
++++ b/Makefile
+@@ -12,8 +12,9 @@ CFLAGS += -MMD -Wall
+ LDLIBS_ASOUND ?= -lasound
+ LDLIBS_OPUS ?= -lopus
+ LDLIBS_ORTP ?= -lortp
++LDLIBS_BCTOOLBOX ?= -lbctoolbox
+ 
+-LDLIBS += $(LDLIBS_ASOUND) $(LDLIBS_OPUS) $(LDLIBS_ORTP)
++LDLIBS += $(LDLIBS_ASOUND) $(LDLIBS_OPUS) $(LDLIBS_ORTP) $(LDLIBS_BCTOOLBOX)
+ 
+ .PHONY:		all install dist clean
+ 
diff --git a/pkgs/tools/audio/trx/default.nix b/pkgs/tools/audio/trx/default.nix
index 1d052adbba9..224c331b961 100644
--- a/pkgs/tools/audio/trx/default.nix
+++ b/pkgs/tools/audio/trx/default.nix
@@ -2,13 +2,19 @@
 
 stdenv.mkDerivation rec {
   pname = "trx";
-  version = "0.4";
+  version = "0.5";
 
   src = fetchurl {
     url = "https://www.pogo.org.uk/~mark/trx/releases/${pname}-${version}.tar.gz";
-    sha256 = "1wsrkbqc090px8i9p8awz38znxjcqjb1dzjjdd8xkjmiprayjhkl";
+    sha256 = "1jjgca92nifjhcr3n0fmpfr6f5gxlqyal2wmgdlgd7hx834r1if7";
   };
 
+  # Makefile is currently missing -lbctoolbox so the build fails when linking
+  # the libraries. This patch adds that flag.
+  patches = [
+    ./add_bctoolbox_ldlib.patch
+  ];
+
   buildInputs = [ alsaLib libopus ortp bctoolbox ];
   makeFlags = [ "PREFIX=$(out)" ];