diff --git a/components/esp32/include/rom/libc_stubs.h b/components/esp32/include/rom/libc_stubs.h
index 0c1876e58..90c0b4468 100644
--- a/components/esp32/include/rom/libc_stubs.h
+++ b/components/esp32/include/rom/libc_stubs.h
@@ -51,7 +51,7 @@ struct syscall_stub_table
     int (*_rename_r)(struct _reent *r, const char*, const char*);
     clock_t (*_times_r)(struct _reent *r, struct tms *);
     int (*_gettimeofday_r) (struct _reent *r, struct timeval *, void *);
-    void (*_raise_r)(struct _reent *r);
+    void (*_raise_r)(struct _reent *r); /* function signature is incorrect in ROM */
     int (*_unlink_r)(struct _reent *r, const char*);
     int (*_link_r)(struct _reent *r, const char*, const char*);
     int (*_stat_r)(struct _reent *r, const char*, struct stat *);
diff --git a/components/newlib/syscalls.c b/components/newlib/syscalls.c
index d3563e247..d1c06a472 100644
--- a/components/newlib/syscalls.c
+++ b/components/newlib/syscalls.c
@@ -68,7 +68,7 @@ int _system_r(struct _reent *r, const char *str)
     return -1;
 }
 
-void _raise_r(struct _reent *r)
+int _raise_r(struct _reent *r, int sig)
 {
     abort();
 }