diff --git a/ChangeLog b/ChangeLog
index 9efe003..3838b7e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,9 @@
 ChangeLog for davfs2
 --------------------
---------------------
+
+2012-08-03 Werner Baumann (werner.baumann@onlinehome.de)
+    * cache.c, kernel_interface.c:
+      Fix integer format warnings.
 
 2012-06-03 Werner Baumann (werner.baumann@onlinehome.de)
     * cache.c, has_permission:
diff --git a/src/Makefile.am b/src/Makefile.am
index 331723e..34313e4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -33,7 +33,8 @@ mount_davfs_SOURCES = cache.c dav_coda.c \
 umount_davfs_SOURCES = umount_davfs.c defaults.h
 
 AM_CPPFLAGS = -I$(top_builddir)/gl -I$(top_srcdir)/gl
-AM_CFLAGS = -Wall
+AM_CFLAGS = -Wall -Werror=format-security \
+            -fstack-protector --param=ssp-buffer-size=4
 DEFS = -DPROGRAM_NAME=\"mount.davfs\" \
        -DDAV_SYS_CONF_DIR=\"$(pkgsysconfdir)\" \
        -DDAV_SYS_RUN=\"$(pkglocalstatedir)\" \
@@ -45,7 +46,8 @@ DEFS = -DPROGRAM_NAME=\"mount.davfs\" \
        -DDAV_DATA_DIR=\"$(pkgdatadir)\" \
        -DLOCALEDIR=\"$(localedir)\" \
        -DDAV_USER=\"$(dav_user)\" \
-       -DDAV_GROUP=\"$(dav_group)\" @DEFS@
+       -DDAV_GROUP=\"$(dav_group)\" \
+       -D_FORTIFY_SOURCE=2 @DEFS@
 LIBS = $(NEON_LIBS) @LIBS@
 mount_davfs_LDADD = $(LIBINTL) $(LIBICONV) ../gl/libgnu.a
 umount_davfs_LDADD = $(LIBINTL) ../gl/libgnu.a
diff --git a/src/cache.c b/src/cache.c
index b0b0748..90f7271 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -592,7 +592,7 @@ dav_init_cache(const dav_args *args, const char *mpoint)
     alignment = test_alignment();
     if (debug)
         syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "Alignment of dav_node: %i",
-               alignment);
+               (int) alignment);
 
     default_uid = args->fsuid;
     default_gid = args->fsgid;
@@ -746,9 +746,10 @@ dav_tidy_cache(void)
 {
     if (debug) {
         syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG),
-               "tidy: %i of %llu nodes changed", nchanged, fs_stat->files);
+               "tidy: %i of %lli nodes changed", nchanged,
+               (long long int) fs_stat->files);
         syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "cache-size: %llu MiBytes.",
-               (cache_size + 0x80000) / 0x100000);
+               (unsigned long long int) (cache_size + 0x80000) / 0x100000);
     }
 
     if (cache_size > max_cache_size)
@@ -1216,7 +1217,8 @@ dav_read(ssize_t *len, dav_node * node, int fd, char *buf, size_t size,
 
     *len = pread(fd, buf, size, offset);
     if (debug)
-        syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "read %i", *len);
+        syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "read %lli",
+               (long long int) *len);
     if (*len < 0)
         return errno;
 
@@ -1609,7 +1611,8 @@ dav_write(size_t *written, dav_node * node, int fd, char *buf, size_t size,
     }
 
     if (debug)
-        syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "  written %i", *written);
+        syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG), "  written %llui",
+               (unsinged long long int) *written);
     return 0;
 }
 
@@ -3059,13 +3062,8 @@ write_node(dav_node *node, FILE *file, const char *indent)
     }
 
     if (is_reg(node)) {
-#if _FILE_OFFSET_BITS == 64
-        if (fprintf(file, "%s<d:%s>%lli</d:%s>\n", ind, type[SIZE], node->size,
-                    type[SIZE]) < 0)
-#else
-        if (fprintf(file, "%s<d:%s>%li</d:%s>\n", ind, type[SIZE], node->size,
-                    type[SIZE]) < 0)
-#endif
+        if (fprintf(file, "%s<d:%s>%lli</d:%s>\n", ind, type[SIZE],
+                    (long long int) node->size, type[SIZE]) < 0)
             return -1;
     }
 
diff --git a/src/kernel_interface.c b/src/kernel_interface.c
index a135d59..2ed5731 100644
--- a/src/kernel_interface.c
+++ b/src/kernel_interface.c
@@ -243,11 +243,11 @@ init_fuse(int *dev, dav_run_msgloop_fn *msg_loop, void **mdata,
 #if SIZEOF_VOID_P == 8
     *mdata = xasprintf("fd=%i,rootmode=%o,user_id=%i,group_id=%i,"
                        "allow_other,max_read=%lu", *dev, mode, owner, group,
-                       *buf_size - 4096);
+                       (unsigned long int) (*buf_size - 4096));
 #else
     *mdata = xasprintf("fd=%i,rootmode=%o,user_id=%i,group_id=%i,"
                        "allow_other,max_read=%u", *dev, mode, owner, group,
-                       *buf_size - 4096);
+                       (unsigned int) (*buf_size - 4096));
 #endif
     if (mount(url, mpoint, "fuse", mopts, *mdata) == 0) {
         *msg_loop = dav_fuse_loop;