diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index 189311f..8bd8d36 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -10,6 +10,7 @@ on:
       - "**/*.exs"
       - "**/*.eex"
       - "mix.lock"
+      - "coveralls.json"
   pull_request:
     branches:
       - master
@@ -19,6 +20,7 @@ on:
       - "**/*.exs"
       - "**/*.eex"
       - "mix.lock"
+      - "coveralls.json"
 
 jobs:
   lint:
diff --git a/coveralls.json b/coveralls.json
index 4cae334..f811b0e 100644
--- a/coveralls.json
+++ b/coveralls.json
@@ -1,5 +1,7 @@
 {
   "skip_files": [
-    "spec/support"
+    "spec/support",
+    "lib/largest_prime_factor/imperative.c",
+    "lib/number_spiral_diagonals/imperative.c"
   ]
 }