diff --git a/Python/bytecodes.c b/Python/bytecodes.c
index 2d7b5ba21ea09d..5b1d70b303060d 100644
--- a/Python/bytecodes.c
+++ b/Python/bytecodes.c
@@ -2686,7 +2686,7 @@ dummy_func(
             assert(next_instr[oparg].op.code == END_FOR ||
                    next_instr[oparg].op.code == INSTRUMENTED_END_FOR);
             assert(1 + INLINE_CACHE_ENTRIES_FOR_ITER == next_instr - frame->instr_ptr);
-            frame->return_offset = 1 + INLINE_CACHE_ENTRIES_FOR_ITER + oparg;
+            frame->return_offset = (uint16_t)(1 + INLINE_CACHE_ENTRIES_FOR_ITER + oparg);
             DISPATCH_INLINED(gen_frame);
         }
 
diff --git a/Python/generated_cases.c.h b/Python/generated_cases.c.h
index d5e0d849efe9d2..fb4506e68765ec 100644
--- a/Python/generated_cases.c.h
+++ b/Python/generated_cases.c.h
@@ -3440,7 +3440,7 @@
             assert(next_instr[oparg].op.code == END_FOR ||
                    next_instr[oparg].op.code == INSTRUMENTED_END_FOR);
             assert(1 + INLINE_CACHE_ENTRIES_FOR_ITER == next_instr - frame->instr_ptr);
-            frame->return_offset = 1 + INLINE_CACHE_ENTRIES_FOR_ITER + oparg;
+            frame->return_offset = (uint16_t)(1 + INLINE_CACHE_ENTRIES_FOR_ITER + oparg);
             DISPATCH_INLINED(gen_frame);
         }