diff --git a/compile.c b/compile.c
index c7dd5cb281..4ff7472331 100644
--- a/compile.c
+++ b/compile.c
@@ -288,7 +288,7 @@ struct iseq_compile_data_ensure_node_stack {
 	  rb_ary_push(branches, INT2FIX(last_line)); \
 	  rb_ary_push(branches, INT2FIX(last_column)); \
 	  rb_ary_push(branches, INT2FIX(counter_idx)); \
-	  ADD_INSN2((seq), (first_line), tracebranch, INT2FIX(RUBY_EVENT_COVERAGE), INT2FIX(counter_idx)); \
+	  ADD_INSN2((seq), (first_line), tracebranch, INT2FIX(RUBY_EVENT_COVERAGE_BRANCH), INT2FIX(counter_idx)); \
       } \
   } while (0)
 
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index ee873182e7..8745fb903a 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -2096,7 +2096,7 @@ int ruby_native_thread_p(void);
 #define RUBY_EVENT_TRACEPOINT_ALL    0xffff
 
 /* special events */
-#define RUBY_EVENT_COVERAGE               0x020000
+#define RUBY_EVENT_RESERVED_FOR_INTERNAL_USE 0x030000
 
 /* internal events */
 #define RUBY_INTERNAL_EVENT_SWITCH          0x040000
diff --git a/thread.c b/thread.c
index 5c7f1909f2..02c689df05 100644
--- a/thread.c
+++ b/thread.c
@@ -5106,7 +5106,7 @@ rb_set_coverages(VALUE coverages, int mode, VALUE me2counter)
     GET_VM()->coverage_mode = mode;
     rb_add_event_hook2((rb_event_hook_func_t) update_line_coverage, RUBY_EVENT_LINE, Qnil, RUBY_EVENT_HOOK_FLAG_SAFE | RUBY_EVENT_HOOK_FLAG_RAW_ARG);
     if (mode & COVERAGE_TARGET_BRANCHES) {
-	rb_add_event_hook2((rb_event_hook_func_t) update_branch_coverage, RUBY_EVENT_COVERAGE, Qnil, RUBY_EVENT_HOOK_FLAG_SAFE | RUBY_EVENT_HOOK_FLAG_RAW_ARG);
+	rb_add_event_hook2((rb_event_hook_func_t) update_branch_coverage, RUBY_EVENT_COVERAGE_BRANCH, Qnil, RUBY_EVENT_HOOK_FLAG_SAFE | RUBY_EVENT_HOOK_FLAG_RAW_ARG);
     }
     if (mode & COVERAGE_TARGET_METHODS) {
 	rb_add_event_hook2((rb_event_hook_func_t) update_method_coverage, RUBY_EVENT_CALL, me2counter, RUBY_EVENT_HOOK_FLAG_SAFE | RUBY_EVENT_HOOK_FLAG_RAW_ARG);
diff --git a/vm_core.h b/vm_core.h
index 2aa2ba04e2..f458da7203 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1753,6 +1753,9 @@ RUBY_SYMBOL_EXPORT_BEGIN
 
 int rb_thread_check_trap_pending(void);
 
+/* #define RUBY_EVENT_RESERVED_FOR_INTERNAL_USE 0x030000 */ /* from vm_core.h */
+#define RUBY_EVENT_COVERAGE_BRANCH              0x010000
+
 extern VALUE rb_get_coverages(void);
 extern void rb_set_coverages(VALUE, int, VALUE);
 extern void rb_reset_coverages(void);