diff --git a/bundled/libdwarf/CMakeLists.txt b/bundled/libdwarf/CMakeLists.txt
index 4227dd2..71abcb0 100644
--- a/bundled/libdwarf/CMakeLists.txt
+++ b/bundled/libdwarf/CMakeLists.txt
@@ -294,6 +294,8 @@ if(NOT CMAKE_DWARF_FINDPACKAGE_Z)
 else()
   find_package(ZLIB REQUIRED)
   set(DW_FZLIB "ZLIB")
+  set(HAVE_ZLIB TRUE)
+  set(HAVE_ZLIB_H TRUE)
 endif()
 
 check_c_source_compiles([=[