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-rw-r--r--src/debug.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/debug.c b/src/debug.c
index 0af0f48f7..ea1aa1ddc 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -95,7 +95,7 @@ mrb_debug_get_line(mrb_irep *irep, uint32_t pc)
mrb_assert(f->lines.flat_map <= ret && ret < (f->lines.flat_map + f->line_entry_count));
/* check pc range */
mrb_assert(ret->start_pos <= pc &&
- pc < (((ret + 1 - f->lines.flat_map) < f->line_entry_count)
+ pc < (((uint32_t)(ret + 1 - f->lines.flat_map) < f->line_entry_count)
? (ret+1)->start_pos : irep->debug_info->pc_count));
return ret->line;