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-rw-r--r--util/coroutine-sigaltstack.c4
-rw-r--r--util/coroutine-ucontext.c4
2 files changed, 4 insertions, 4 deletions
diff --git a/util/coroutine-sigaltstack.c b/util/coroutine-sigaltstack.c
index e2690c5f41..037d6416c4 100644
--- a/util/coroutine-sigaltstack.c
+++ b/util/coroutine-sigaltstack.c
@@ -22,9 +22,9 @@
  */
 
 /* XXX Is there a nicer way to disable glibc's stack check for longjmp? */
-#ifdef _FORTIFY_SOURCE
 #undef _FORTIFY_SOURCE
-#endif
+#define _FORTIFY_SOURCE 0
+
 #include "qemu/osdep.h"
 #include <pthread.h>
 #include "qemu/coroutine_int.h"
diff --git a/util/coroutine-ucontext.c b/util/coroutine-ucontext.c
index ddc98fb4f8..7b304c79d9 100644
--- a/util/coroutine-ucontext.c
+++ b/util/coroutine-ucontext.c
@@ -19,9 +19,9 @@
  */
 
 /* XXX Is there a nicer way to disable glibc's stack check for longjmp? */
-#ifdef _FORTIFY_SOURCE
 #undef _FORTIFY_SOURCE
-#endif
+#define _FORTIFY_SOURCE 0
+
 #include "qemu/osdep.h"
 #include <ucontext.h>
 #include "qemu/coroutine_int.h"