diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fae578f..715a706 100755
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,7 +32,7 @@ jobs:
           force_orphan: true
           publish_branch: gh-pages
 
-  run-tests:
+  run-tests-with-coverage:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
@@ -43,3 +43,10 @@ jobs:
         run: sudo apt-get install gcc make
       - name: Run tests
         run: make -C test tests
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          gcov: true
+          working-directory: src
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.gitignore b/.gitignore
index 45e82d8..1854052 100755
--- a/.gitignore
+++ b/.gitignore
@@ -24,6 +24,7 @@ html
 # test coverage
 *.gcda
 *.gcno
+*.gcov
 
 # Linker output
 *.ilk
diff --git a/test/Makefile b/test/Makefile
index b48a99d..b6b0453 100755
--- a/test/Makefile
+++ b/test/Makefile
@@ -1,5 +1,5 @@
 # Compiler
-CC = gcc -std=c99 #-Wall -Wextra -Werror -pedantic -g
+CC = gcc -std=c99 -fprofile-arcs -ftest-coverage -O0 #-Wall -Wextra -Werror -pedantic -g
 
 # Directories
 SRC_DIR = ../src