diff --git a/lib/licenses.nix b/lib/licenses.nix
index 0fd641085374..615a6b388153 100644
--- a/lib/licenses.nix
+++ b/lib/licenses.nix
@@ -481,6 +481,11 @@ in mkLicense lset) ({
     free = false;
   };
 
+  fraunhofer-fdk = {
+    fullName = "Fraunhofer FDK AAC Codec Library";
+    spdxId = "FDK-AAC";
+  };
+
   free = {
     fullName = "Unspecified free software license";
   };
diff --git a/pkgs/development/libraries/fdk-aac/default.nix b/pkgs/development/libraries/fdk-aac/default.nix
index 71077d6e315e..99e211877da1 100644
--- a/pkgs/development/libraries/fdk-aac/default.nix
+++ b/pkgs/development/libraries/fdk-aac/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "A high-quality implementation of the AAC codec from Android";
     homepage = "https://sourceforge.net/projects/opencore-amr/";
-    license = licenses.asl20;
+    license = licenses.fraunhofer-fdk;
     maintainers = with maintainers; [ codyopel ];
     platforms = platforms.all;
   };