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-rw-r--r--examples/qemu_persistent_hook/test.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/examples/qemu_persistent_hook/test.c b/examples/qemu_persistent_hook/test.c
index 83001545..f6672027 100644
--- a/examples/qemu_persistent_hook/test.c
+++ b/examples/qemu_persistent_hook/test.c
@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-int target_func(char *buf, int size) {
+int target_func(unsigned char *buf, int size) {
 
   printf("buffer:%p, size:%p\n", buf, size);
   switch (buf[0]) {