diff --git a/pkgs/development/misc/h3/default.nix b/pkgs/development/misc/h3/default.nix
index 13c8f8d0424e..b0b13cd03331 100644
--- a/pkgs/development/misc/h3/default.nix
+++ b/pkgs/development/misc/h3/default.nix
@@ -18,6 +18,8 @@ let
         inherit hash;
       };
 
+      outputs = [ "out" "dev" ];
+
       nativeBuildInputs = [ cmake ];
 
       cmakeFlags = [
diff --git a/pkgs/development/python-modules/h3/default.nix b/pkgs/development/python-modules/h3/default.nix
index f512d7c08cc5..f5413e544843 100644
--- a/pkgs/development/python-modules/h3/default.nix
+++ b/pkgs/development/python-modules/h3/default.nix
@@ -50,7 +50,7 @@ buildPythonPackage rec {
   prePatch =
     let
       cmakeCommands = ''
-        include_directories(${h3}/include/h3)
+        include_directories(${lib.getDev h3}/include/h3)
         link_directories(${h3}/lib)
       '';
     in ''