diff --git a/pkgs/applications/audio/ft2-clone/default.nix b/pkgs/applications/audio/ft2-clone/default.nix
index 24bc34089823..7045d6811d38 100644
--- a/pkgs/applications/audio/ft2-clone/default.nix
+++ b/pkgs/applications/audio/ft2-clone/default.nix
@@ -32,7 +32,9 @@ stdenv.mkDerivation rec {
     homepage = "https://16-bits.org/ft2.php";
     license = licenses.bsd3;
     maintainers = with maintainers; [ fgaz ];
-    platforms = platforms.all;
+    # From HOW-TO-COMPILE.txt:
+    # > This code is NOT big-endian compatible
+    platforms = platforms.littleEndian;
   };
 }
 
diff --git a/pkgs/applications/audio/pt2-clone/default.nix b/pkgs/applications/audio/pt2-clone/default.nix
index 8a0cd99ff2ba..d39156f69d01 100644
--- a/pkgs/applications/audio/pt2-clone/default.nix
+++ b/pkgs/applications/audio/pt2-clone/default.nix
@@ -29,7 +29,9 @@ stdenv.mkDerivation rec {
     homepage = "https://16-bits.org/pt2.php";
     license = licenses.bsd3;
     maintainers = with maintainers; [ fgaz ];
-    platforms = platforms.all;
+    # From HOW-TO-COMPILE.txt:
+    # > This code is NOT big-endian compatible
+    platforms = platforms.littleEndian;
   };
 }