diff --git a/pkgs/top-level/stage.nix b/pkgs/top-level/stage.nix
index e5412c409ed5..2b503bce7c04 100644
--- a/pkgs/top-level/stage.nix
+++ b/pkgs/top-level/stage.nix
@@ -199,8 +199,8 @@ let
 
     # All packages built with the Musl libc. This will override the
     # default GNU libc on Linux systems. Non-Linux systems are not
-    # supported.
-    pkgsMusl = if stdenv.hostPlatform.isLinux then nixpkgsFun {
+    # supported. 32-bit is also not supported.
+    pkgsMusl = if stdenv.hostPlatform.isLinux && stdenv.buildPlatform.is64bit then nixpkgsFun {
       overlays = [ (self': super': {
         pkgsMusl = super';
       })] ++ overlays;
@@ -208,7 +208,7 @@ let
         then "localSystem" else "crossSystem"} = {
         parsed = makeMuslParsedPlatform stdenv.hostPlatform.parsed;
       };
-    } else throw "Musl libc only supports Linux systems.";
+    } else throw "Musl libc only supports 64-bit Linux systems.";
 
     # All packages built for i686 Linux.
     # Used by wine, firefox with debugging version of Flash, ...