diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
new file mode 100644
index 0000000..2af0e23
--- /dev/null
+++ b/.github/workflows/python-app.yml
@@ -0,0 +1,32 @@
+# This workflow will install Python dependencies, run tests and lint with a single version of Python
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Python application
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v3
+      with:
+        python-version: "3.10"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements-test.txt
+    - name: Test with pytest
+      run: |
+        pytest
diff --git a/database_sanitizer/tests/test_dump_mysql.py b/database_sanitizer/tests/test_dump_mysql.py
index 071e79b..5db7b63 100644
--- a/database_sanitizer/tests/test_dump_mysql.py
+++ b/database_sanitizer/tests/test_dump_mysql.py
@@ -35,6 +35,26 @@
 --- Final line after `INSERT INTO` statement.
 """
 
+MOCK_MYSQLDUMP_OUTPUT_WITH_NEGINT = b"""
+--- Fake MySQL database dump
+
+DROP TABLE IF EXISTS `test`;
+
+CREATE TABLE `test` (
+`id` int(11) NOT NULL AUTO_INCREMENT,
+`created_at` date NOT NULL,
+`notes` varchar(255) NOT NULL,
+PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+INSERT INTO `test` (`id`, `created_at`, `notes`) VALUES \
+(-1,'2018-01-01','Test data 1'),\
+(2,'2018-01-02','Test data 2'),\
+(3,'2018-01-03','Test data 3');
+
+--- Final line after `INSERT INTO` statement.
+"""
+
 MOCK_MYSQLDUMP_OUTPUT_WITH_U2028 = b"""
 --- Fake MySQL database dump
 
@@ -87,6 +107,20 @@ def test_sanitize_from_stream():
 (3,'2018-01-03','Sanitized');\
 """ in dump_output_lines
 
+def test_sanitize_with_negint_from_stream():
+    stream = io.BytesIO(MOCK_MYSQLDUMP_OUTPUT_WITH_NEGINT)
+    config = Configuration()
+    config.sanitizers["test.notes"] = lambda value: "Sanitized"
+    dump_output_lines = list(sanitize_from_stream(stream, config))
+
+    assert "--- Fake MySQL database dump" in dump_output_lines
+    assert "--- Final line after `INSERT INTO` statement." in dump_output_lines
+    assert """INSERT INTO `test` (`id`, `created_at`, `notes`) VALUES \
+(-1,'2018-01-01','Sanitized'),\
+(2,'2018-01-02','Sanitized'),\
+(3,'2018-01-03','Sanitized');\
+""" in dump_output_lines
+
 def test_sanitize_with_u2028_from_stream():
     stream = io.BytesIO(MOCK_MYSQLDUMP_OUTPUT_WITH_U2028)
     config = Configuration()
diff --git a/database_sanitizer/utils/mysql.py b/database_sanitizer/utils/mysql.py
index 794d5e7..31ba151 100644
--- a/database_sanitizer/utils/mysql.py
+++ b/database_sanitizer/utils/mysql.py
@@ -64,7 +64,7 @@ def get_mysqldump_args_and_env_from_url(url):
 MYSQL_NULL_PATTERN = re.compile(r"^NULL$", re.IGNORECASE)
 MYSQL_BOOLEAN_PATTERN = re.compile(r"^(TRUE|FALSE)$", re.IGNORECASE)
 MYSQL_FLOAT_PATTERN = re.compile(r"^[+-]?\d*\.\d+([eE][+-]?\d+)?$")
-MYSQL_INT_PATTERN = re.compile(r"^\d+$")
+MYSQL_INT_PATTERN = re.compile(r"^[+-]?\d+$")
 MYSQL_STRING_PATTERN = re.compile(r"'(?:[^']|''|\\')*(?<![\\])'")