diff --git a/pkgs/development/libraries/openbabel/2.nix b/pkgs/development/libraries/openbabel/2.nix
index 3e989561470..0cc752d993f 100644
--- a/pkgs/development/libraries/openbabel/2.nix
+++ b/pkgs/development/libraries/openbabel/2.nix
@@ -19,6 +19,10 @@ stdenv.mkDerivation rec {
     })
   ];
 
+  postPatch = ''
+    sed '1i#include <ctime>' -i include/openbabel/obutil.h # gcc12
+  '';
+
   buildInputs = [ zlib libxml2 eigen python3 cairo pcre ];
 
   nativeBuildInputs = [ cmake pkg-config ];