diff --git a/pkgs/development/libraries/libclc/default.nix b/pkgs/development/libraries/libclc/default.nix
index e91981c36c5c..289fa20335a0 100644
--- a/pkgs/development/libraries/libclc/default.nix
+++ b/pkgs/development/libraries/libclc/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation {
   '';
 
   configurePhase = ''
-    ${python.interpreter} ./configure.py --prefix=$out
+    ${python2.interpreter} ./configure.py --prefix=$out
   '';
 
   meta = with stdenv.lib; {
diff --git a/pkgs/development/tools/pydb/default.nix b/pkgs/development/tools/pydb/default.nix
index e71eca0a3fa9..e174184835a4 100644
--- a/pkgs/development/tools/pydb/default.nix
+++ b/pkgs/development/tools/pydb/default.nix
@@ -12,10 +12,10 @@ stdenv.mkDerivation {
 
   preConfigure = ''
     p="$(toPythonPath $out)"
-    configureFlags="$configureFlags --with-python=${python.interpreter} --with-site-packages=$p"
+    configureFlags="$configureFlags --with-python=${python2.interpreter} --with-site-packages=$p"
   '';
 
-  meta = { 
+  meta = {
     description = "Python debugger with GDB-like commands and Emacs bindings";
     homepage = http://bashdb.sourceforge.net/pydb/;
     license = stdenv.lib.licenses.gpl3;