1 files changed, 3 insertions, 3 deletions

diff --git a/compile.c b/compile.c
index 45cb116983..7d553bfba1 100644
--- a/compile.c
+++ b/compile.c
@@ -2308,9 +2308,9 @@ iseq_set_sequence(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
                 if (ISEQ_COVERAGE(iseq)) {
                     if (ISEQ_LINE_COVERAGE(iseq) && (events & RUBY_EVENT_COVERAGE_LINE) &&
                         !(rb_get_coverage_mode() & COVERAGE_TARGET_ONESHOT_LINES)) {
-                        int line = iobj->insn_info.line_no;
-                        if (line >= 1) {
-                            RARRAY_ASET(ISEQ_LINE_COVERAGE(iseq), line - 1, INT2FIX(0));
+                        int line = iobj->insn_info.line_no - 1;
+                        if (line >= 0 && line < RARRAY_LEN(ISEQ_LINE_COVERAGE(iseq))) {
+                            RARRAY_ASET(ISEQ_LINE_COVERAGE(iseq), line, INT2FIX(0));
                         }
                     }
                     if (ISEQ_BRANCH_COVERAGE(iseq) && (events & RUBY_EVENT_COVERAGE_BRANCH)) {