diff --git a/pkgs/os-specific/linux/zfs/default.nix b/pkgs/os-specific/linux/zfs/default.nix
index c9f0438c86f5..2d1775dac63e 100644
--- a/pkgs/os-specific/linux/zfs/default.nix
+++ b/pkgs/os-specific/linux/zfs/default.nix
@@ -140,6 +140,10 @@ let
         "INSTALL_MOD_PATH=\${out}"
       ];
 
+      postBuild = optionalString buildKernel ''
+         find . -name "*.ko" -print0 | xargs -0 -P$NIX_BUILD_CORES strip --strip-debug
+      '';
+
       postInstall = optionalString buildKernel ''
         # Add reference that cannot be detected due to compressed kernel module
         mkdir -p "$out/nix-support"