diff --git a/config/m4/sysdep.m4 b/config/m4/sysdep.m4
index b1e5485..0133803 100644
--- a/config/m4/sysdep.m4
+++ b/config/m4/sysdep.m4
@@ -158,7 +158,7 @@ AC_MSG_CHECKING([malloc hooks])
 SAVE_CFLAGS=$CFLAGS
 CFLAGS="$CFLAGS $CFLAGS_NO_DEPRECATED"
 CHECK_CROSS_COMP([AC_LANG_SOURCE([#include <malloc.h>
-                                  static int rc = 1;
+                                  static volatile int rc = 1;
                                   void *ptr;
                                   void *myhook(size_t size, const void *caller) {
                                       rc = 0;
diff --git a/configure b/configure
index db54a6a..fa4352d 100755
--- a/configure
+++ b/configure
@@ -22221,7 +22221,7 @@ CFLAGS="$CFLAGS $CFLAGS_NO_DEPRECATED"
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <malloc.h>
-                                  static int rc = 1;
+                                  volatile static int rc = 1;
                                   void *ptr;
                                   void *myhook(size_t size, const void *caller) {
                                       rc = 0;
@@ -22252,7 +22252,7 @@ else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <malloc.h>
-                                  static int rc = 1;
+                                  volatile static int rc = 1;
                                   void *ptr;
                                   void *myhook(size_t size, const void *caller) {
                                       rc = 0;