diff --git a/pkgs/development/python-modules/r2pipe/default.nix b/pkgs/development/python-modules/r2pipe/default.nix
index 341d3f9660c..7c1bb88bcaa 100644
--- a/pkgs/development/python-modules/r2pipe/default.nix
+++ b/pkgs/development/python-modules/r2pipe/default.nix
@@ -18,10 +18,10 @@ buildPythonPackage rec {
   ''
     # Fix find_library, can be removed after
     # https://github.com/NixOS/nixpkgs/issues/7307 is resolved.
-    substituteInPlace r2pipe/native.py --replace "find_library('r_core')" "'${libr_core}'"
+    substituteInPlace r2pipe/native.py --replace 'find_library("r_core")' "'${libr_core}'"
 
     # Fix the default r2 executable
-    substituteInPlace r2pipe/open_sync.py --replace "r2e = 'radare2'" "r2e = '${radare2}/bin/radare2'"
+    substituteInPlace r2pipe/open_sync.py --replace 'r2e = "radare2"' "r2e = '${radare2}/bin/radare2'"
     substituteInPlace r2pipe/open_base.py --replace 'which("radare2")' "'${radare2}/bin/radare2'"
   '';