1 files changed, 1 insertions, 1 deletions

diff --git a/m4/check-hardening-options.m4 b/m4/check-hardening-options.m4
index 3ffdb1a..869f00b 100644
--- a/m4/check-hardening-options.m4
+++ b/m4/check-hardening-options.m4
@@ -73,7 +73,7 @@ AC_DEFUN([CHECK_C_HARDENING_OPTIONS], [
                 CHECK_CFLAG([[-fno-strict-overflow]])
 
                 # _FORTIFY_SOURCE replaces builtin functions with safer versions.
-                CHECK_CFLAG([[-D_FORTIFY_SOURCE=2]])
+                AX_ADD_FORTIFY_SOURCE
 
                 # Enable read only relocations
                 CHECK_LDFLAG([[-Wl,-z,relro]])