1 files changed, 2 insertions, 2 deletions
diff --git a/src/vm.c b/src/vm.c
index 5543496c1..689c5b85e 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1375,7 +1375,7 @@ RETRY_TRY_BLOCK:
       recv = regs[a];
       blk = regs[bidx];
       if (!mrb_nil_p(blk) && !mrb_proc_p(blk)) {
-        blk = mrb_convert_type(mrb, blk, MRB_TT_PROC, "Proc", "to_proc");
+        blk = mrb_convert_type(mrb, blk, MRB_TT_PROC, MRB_SYM(to_proc));
         /* The stack might have been reallocated during mrb_convert_type(),
            see #3622 */
         regs[bidx] = blk;
@@ -1557,7 +1557,7 @@ RETRY_TRY_BLOCK:
       }
       blk = regs[bidx];
       if (!mrb_nil_p(blk) && !mrb_proc_p(blk)) {
-        blk = mrb_convert_type(mrb, blk, MRB_TT_PROC, "Proc", "to_proc");
+        blk = mrb_convert_type(mrb, blk, MRB_TT_PROC, MRB_SYM(to_proc));
         /* The stack or ci stack might have been reallocated during
            mrb_convert_type(), see #3622 and #3784 */
         regs[bidx] = blk;