diff --git a/.github/codecov.yml b/.github/codecov.yml
index f8c332d0f0..b77661e638 100644
--- a/.github/codecov.yml
+++ b/.github/codecov.yml
@@ -39,3 +39,17 @@ ignore:
   - "dev_tools/**"
   - "tests/**"
   - "util/**"
+  # Sources produced by dev_tools/bin/gen-ifc-map.
+  - '^src/ifc_map\.h$'
+  - '^src/ifc_map_functions\.c$'
+  - '^src/ifc_map_functions\.h$'
+  - '^src/ifc_map_functions_acc\.c$'
+  - '^src/ifc_map_functions_dbg\.c$'
+  - '^src/ifc_map_functions_mut\.c$'
+  - '^src/ifc_map_functions_val\.c$'
+  - '^src/ifc_modules_inst\.h$'
+  - '^src/ifc_modules_spec\.h$'
+  # Large generated data tables.
+  - '^src/unicode_name_fsm\.c$'
+  - '^src/builtin_defs\.h$'
+  - '^src/builtin_kinds\.h$'