diff --git a/srcpkgs/nix/template b/srcpkgs/nix/template
index b465c5d411c..77931f82ebc 100644
--- a/srcpkgs/nix/template
+++ b/srcpkgs/nix/template
@@ -38,7 +38,7 @@ distfiles="http://nixos.org/releases/nix/nix-${version}/nix-${version}.tar.xz"
 checksum=937779ed2efaa3dec210250635401980acb99a6fea6d7374fbaea78231b36d34
 
 pre_configure() {
-	sed -i 's/ucontext/struct ucontext_t/g' src/libmain/stack.cc
+	sed -i 's/ucontext/ucontext_t/g' src/libmain/stack.cc
 	sed -i '/^CFLAGS=/d;/^CXXFLAGS=/d' configure
 	echo "GLOBAL_LDFLAGS += $LDFLAGS" >>mk/lib.mk
 }