diff --git a/coroutine/ucontext/Context.c b/coroutine/ucontext/Context.c
index 2dc3f478e8..9ba76ee628 100644
--- a/coroutine/ucontext/Context.c
+++ b/coroutine/ucontext/Context.c
@@ -15,7 +15,7 @@
 
 void coroutine_trampoline(void * _start, void * _context)
 {
-    coroutine_start start = _start;
+    coroutine_start start = (coroutine_start)_start;
     struct coroutine_context * context = _context;
 
     start(context->from, context);
diff --git a/mjit.c b/mjit.c
index 5d1a182b0b..697dd23954 100644
--- a/mjit.c
+++ b/mjit.c
@@ -464,7 +464,7 @@ rb_mjit_recompile_iseq(const rb_iseq_t *iseq)
 
     CRITICAL_SECTION_START(3, "in rb_mjit_recompile_iseq");
     remove_from_list(iseq->body->jit_unit, &active_units);
-    iseq->body->jit_func = (void *)NOT_ADDED_JIT_ISEQ_FUNC;
+    iseq->body->jit_func = (mjit_func_t)NOT_ADDED_JIT_ISEQ_FUNC;
     add_to_list(iseq->body->jit_unit, &stale_units);
     CRITICAL_SECTION_FINISH(3, "in rb_mjit_recompile_iseq");