diff --git a/pkgs/stdenv/darwin/default.nix b/pkgs/stdenv/darwin/default.nix
index b07a694276e..772b8973e6c 100644
--- a/pkgs/stdenv/darwin/default.nix
+++ b/pkgs/stdenv/darwin/default.nix
@@ -16,4 +16,9 @@ genericStdenv {
   };
 
   shell = "/bin/sh";
+
+  extraAttrs = {
+    # Curl should be in /usr/bin or so.
+    curl = null;
+  };
 }
diff --git a/pkgs/stdenv/freebsd/default.nix b/pkgs/stdenv/freebsd/default.nix
index 2fa92f7d95b..a94533edfaf 100644
--- a/pkgs/stdenv/freebsd/default.nix
+++ b/pkgs/stdenv/freebsd/default.nix
@@ -16,4 +16,9 @@ genericStdenv {
   };
 
   shell = "/bin/bash";
+
+  extraAttrs = {
+    # Curl should be in /usr/bin or so.
+    curl = null;
+  };
 }