diff --git a/tests/unit/CMakeLists.txt b/tests/unit/CMakeLists.txt
index b2fcc89..8b03c15 100644
--- a/tests/unit/CMakeLists.txt
+++ b/tests/unit/CMakeLists.txt
@@ -22,9 +22,6 @@ macro(add_postsrsd_test name)
     target_compile_definitions(
         ${name}_executable PRIVATE _GNU_SOURCE _FILE_OFFSET_BITS=64
     )
-    if(HAVE_CLOSE_RANGE_GNU AND NOT HAVE_CLOSE_RANGE)
-        target_compile_definitions(${name}_executable PRIVATE _GNU_SOURCE)
-    endif()
     target_link_libraries(${name}_executable PRIVATE Check::check)
     target_compile_features(${name}_executable PRIVATE c_std_99)
     if(TESTS_WITH_ASAN)