diff --git a/pkgs/applications/networking/p2p/opentracker/default.nix b/pkgs/applications/networking/p2p/opentracker/default.nix
index 581560ae78b..8f63f27cf4d 100644
--- a/pkgs/applications/networking/p2p/opentracker/default.nix
+++ b/pkgs/applications/networking/p2p/opentracker/default.nix
@@ -12,12 +12,9 @@ stdenv.mkDerivation {
   buildInputs = [ libowfat zlib ];
 
   postPatch = ''
-    substituteInPlace Makefile --replace \
-      'LIBOWFAT_HEADERS=$(PREFIX)/libowfat' \
-      'LIBOWFAT_HEADERS=${libowfat}/include/libowfat'
-    substituteInPlace Makefile --replace \
-      'LIBOWFAT_LIBRARY=$(PREFIX)/libowfat' \
-      'LIBOWFAT_LIBRARY=${libowfat}/lib'
+    substituteInPlace Makefile \
+      --replace 'LIBOWFAT_HEADERS=$(PREFIX)/libowfat' 'LIBOWFAT_HEADERS=${libowfat}/include/libowfat' \
+      --replace 'LIBOWFAT_LIBRARY=$(PREFIX)/libowfat' 'LIBOWFAT_LIBRARY=${libowfat}/lib'
   '';
 
   installPhase = ''