diff --git a/pkgs/servers/sql/postgresql/ext/plv8.nix b/pkgs/servers/sql/postgresql/ext/plv8.nix
index 6f5411340e45..3fc6460adadb 100644
--- a/pkgs/servers/sql/postgresql/ext/plv8.nix
+++ b/pkgs/servers/sql/postgresql/ext/plv8.nix
@@ -29,6 +29,8 @@ stdenv.mkDerivation rec {
   ];
 
   preConfigure = ''
+    # We build V8 as a monolith, so this is unnecessary.
+    substituteInPlace Makefile.shared --replace "-lv8_libplatform" ""
     patchShebangs ./generate_upgrade.sh
     substituteInPlace generate_upgrade.sh \
       --replace " 2.3.10)" " 2.3.10 2.3.11 2.3.12 2.3.13 2.3.14 2.3.15)"
@@ -42,10 +44,14 @@ stdenv.mkDerivation rec {
     rmdir "$out/nix/store"/* "$out/nix/store" "$out/nix"
   '';
 
-  # Without this, PostgreSQL will crash at runtime.
-  # The flags are only included in Makefile, not Makefile.shared.
-  # https://github.com/plv8/plv8/pull/469
-  NIX_CFLAGS_COMPILE = "-DJSONB_DIRECT_CONVERSION -DV8_COMPRESS_POINTERS=1 -DV8_31BIT_SMIS_ON_64BIT_ARCH=1";
+  NIX_CFLAGS_COMPILE = [
+    # V8 depends on C++14.
+    "-std=c++14"
+    # Without this, PostgreSQL will crash at runtime.
+    # The flags are only included in Makefile, not Makefile.shared.
+    # https://github.com/plv8/plv8/pull/469
+    "-DJSONB_DIRECT_CONVERSION" "-DV8_COMPRESS_POINTERS=1" "-DV8_31BIT_SMIS_ON_64BIT_ARCH=1"
+  ];
 
   meta = with lib; {
     description = "V8 Engine Javascript Procedural Language add-on for PostgreSQL";
diff --git a/pkgs/servers/sql/postgresql/packages.nix b/pkgs/servers/sql/postgresql/packages.nix
index e751ae621f32..f3df8a99ca22 100644
--- a/pkgs/servers/sql/postgresql/packages.nix
+++ b/pkgs/servers/sql/postgresql/packages.nix
@@ -26,7 +26,9 @@ self: super: {
 
     plr = super.callPackage ./ext/plr.nix { };
 
-    plv8 = super.callPackage ./ext/plv8.nix { };
+    plv8 = super.callPackage ./ext/plv8.nix {
+      v8 = self.v8_8_x;
+    };
 
     pgjwt = super.callPackage ./ext/pgjwt.nix { };