diff --git a/dump.c b/dump.c
index 80a9116c77..42622def09 100644
--- a/dump.c
+++ b/dump.c
@@ -99,7 +99,7 @@ static void dump_error(DumpState *s, const char *reason)
     dump_cleanup(s);
 }
 
-static int fd_write_vmcore(void *buf, size_t size, void *opaque)
+static int fd_write_vmcore(const void *buf, size_t size, void *opaque)
 {
     DumpState *s = opaque;
     size_t written_size;
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 367eda17d1..d734be8a40 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -28,7 +28,8 @@
 #include "qemu/tls.h"
 #include "qemu/typedefs.h"
 
-typedef int (*WriteCoreDumpFunction)(void *buf, size_t size, void *opaque);
+typedef int (*WriteCoreDumpFunction)(const void *buf, size_t size,
+                                     void *opaque);
 
 /**
  * vaddr: