diff --git a/pkgs/by-name/x1/x16/package.nix b/pkgs/by-name/x1/x16/package.nix
index 5f53898b338c..aa731c436cd2 100644
--- a/pkgs/by-name/x1/x16/package.nix
+++ b/pkgs/by-name/x1/x16/package.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   postPatch = ''
     substituteInPlace Makefile \
-      --replace '/bin/echo' 'echo'
+      --replace-fail '/bin/echo' 'echo'
   '';
 
   dontConfigure = true;
diff --git a/pkgs/by-name/x1/x16/rom.nix b/pkgs/by-name/x1/x16/rom.nix
index e44884436f88..b7c290dd6489 100644
--- a/pkgs/by-name/x1/x16/rom.nix
+++ b/pkgs/by-name/x1/x16/rom.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation (finalAttrs: {
   postPatch = ''
     patchShebangs findsymbols scripts/
     substituteInPlace Makefile \
-    --replace '/bin/echo' 'echo'
+    --replace-fail '/bin/echo' 'echo'
   '';
 
   dontConfigure = true;