diff --git a/libc/utils/MPFRWrapper/CMakeLists.txt b/libc/utils/MPFRWrapper/CMakeLists.txt
index 829c2fb2c2f90..8aeee2463dc51 100644
--- a/libc/utils/MPFRWrapper/CMakeLists.txt
+++ b/libc/utils/MPFRWrapper/CMakeLists.txt
@@ -28,6 +28,8 @@ if(LIBC_TESTS_CAN_USE_MPFR)
     MPFRUtils.h
   )
   _get_common_test_compile_options(compile_options "" "")
+  # mpfr/gmp headers do not work with -ffreestanding flag.
+  list(REMOVE_ITEM compile_options "-ffreestanding")
   target_compile_options(libcMPFRWrapper PRIVATE -O3 ${compile_options})
   add_dependencies(
     libcMPFRWrapper