diff --git a/libraries.nix b/libraries.nix
index bfd2c28..c82f548 100644
--- a/libraries.nix
+++ b/libraries.nix
@@ -19,7 +19,7 @@ let
         runHook postInstall
       '';
       nativeBuildInputs = [ pkgs.unzip ];
-      src = fetchurl ({
+      src = pkgs.fetchurl ({
         url = url;
       } // (convertHash checksum));
     };
diff --git a/packages.nix b/packages.nix
index 4bc3a71..fc7c973 100644
--- a/packages.nix
+++ b/packages.nix
@@ -26,7 +26,7 @@ let
               cp -R * "$out/$dirName/"
             '';
             nativeBuildInputs = [ pkgs.unzip ];
-            src = fetchurl ({
+            src = pkgs.fetchurl ({
               url = system.url;
             } // (convertHash system.checksum));
           };
@@ -58,7 +58,7 @@ let
           runHook postInstall
         '';
         nativeBuildInputs = [ pkgs.unzip ];
-        src = fetchurl ({
+        src = pkgs.fetchurl ({
           url = url;
         } // (convertHash checksum));
       };