diff --git a/autospec/specfiles.py b/autospec/specfiles.py
index b041207..2be1b0d 100644
--- a/autospec/specfiles.py
+++ b/autospec/specfiles.py
@@ -436,6 +436,7 @@ class Specfile(object):
                 flags.extend(["-Os", "-ffunction-sections", "-fdata-sections", "-fno-semantic-interposition"])
         if config.config_opts['security_sensitive']:
             flags.append("-fstack-protector-strong")
+            flags.append("-mzero-caller-saved-regs")
         if self.need_avx2_flags:
             flags.extend(["-O3", "-march=haswell"])
         if self.need_avx512_flags: