diff --git a/pkgs/by-name/vi/visual-hexdiff/package.nix b/pkgs/by-name/vi/visual-hexdiff/package.nix
index b127f0869826..3e374ae7d997 100644
--- a/pkgs/by-name/vi/visual-hexdiff/package.nix
+++ b/pkgs/by-name/vi/visual-hexdiff/package.nix
@@ -26,15 +26,17 @@ stdenv.mkDerivation {
     })
   ];
 
-  postPatch = ''
-    # Fix compiler error that wants a string literal as format string for `wprintw`
-    substituteInPlace sel_file.c \
-      --replace-fail 'wprintw(win, txt_aide_fs[foo]);' 'wprintw(win, "%s", txt_aide_fs[foo]);'
-  '' + lib.optionalString stdenv.hostPlatform.isDarwin ''
-    # Fix compiler error on Darwin: conflicting types for 'strdup'
-    substituteInPlace sel_file.c \
-      --replace-fail 'char *strdup(char *);' ' '
-  '';
+  postPatch =
+    ''
+      # Fix compiler error that wants a string literal as format string for `wprintw`
+      substituteInPlace sel_file.c \
+        --replace-fail 'wprintw(win, txt_aide_fs[foo]);' 'wprintw(win, "%s", txt_aide_fs[foo]);'
+    ''
+    + lib.optionalString stdenv.hostPlatform.isDarwin ''
+      # Fix compiler error on Darwin: conflicting types for 'strdup'
+      substituteInPlace sel_file.c \
+        --replace-fail 'char *strdup(char *);' ' '
+    '';
 
   buildInputs = [ ncurses ];