diff --git a/pkgs/by-name/sc/scalp/package.nix b/pkgs/by-name/sc/scalp/package.nix
index 643fe77fd49d..f574d7467d8c 100644
--- a/pkgs/by-name/sc/scalp/package.nix
+++ b/pkgs/by-name/sc/scalp/package.nix
@@ -24,6 +24,7 @@ stdenv.mkDerivation rec {
   };
 
   postPatch = ''
+    sed -i "1i\#include <cstdint>" src/ScaLP/Solver.cpp
     substituteInPlace CMakeLists.txt \
       --replace-fail "cmake_minimum_required (VERSION 3.3.2)" "cmake_minimum_required (VERSION 3.5)" \
       --replace-fail "\''$ORIGIN" "\''${CMAKE_INSTALL_PREFIX}/lib" \