diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
index e05dc4d..e20e4a5 100644
--- a/.github/workflows/python-test.yml
+++ b/.github/workflows/python-test.yml
@@ -5,9 +5,9 @@ name: Test
 
 on:
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
-    branches: [master]
+    branches: [main]
 
 jobs:
   test:
diff --git a/pycron/__init__.py b/pycron/__init__.py
index 0486c23..3e74887 100644
--- a/pycron/__init__.py
+++ b/pycron/__init__.py
@@ -27,11 +27,11 @@ def _to_int(value, allow_daynames=False):
     if isinstance(value, int) or (isinstance(value, str) and value.isnumeric()):
         return int(value)
 
-    if isinstance(value, str) and allow_daynames and value in DAY_NAMES:
-        return DAY_NAMES.index(value)
+    if isinstance(value, str) and allow_daynames and value.lower() in DAY_NAMES:
+        return DAY_NAMES.index(value.lower())
 
-    if isinstance(value, str) and allow_daynames and value in DAY_ABBRS:
-        return DAY_ABBRS.index(value)
+    if isinstance(value, str) and allow_daynames and value.lower() in DAY_ABBRS:
+        return DAY_ABBRS.index(value.lower())
 
     raise ValueError("Failed to parse string to integer")
 
diff --git a/tests/test_day_names.py b/tests/test_day_names.py
index d1025f5..89f7f61 100644
--- a/tests/test_day_names.py
+++ b/tests/test_day_names.py
@@ -48,6 +48,19 @@ def run(now):
             assert pycron.is_now("* * * * tuesday-sunday/2", now) is False
             assert pycron.is_now("* * * * tue-sun/2", now) is False
 
+            # Test capitalised names
+            assert pycron.is_now("* * * * THU", now)
+            assert pycron.is_now("* * * * THURSDAY", now)
+            assert pycron.is_now("* * * * */THU", now)
+            assert pycron.is_now("* * * * */THURSDAY", now)
+            assert pycron.is_now("* * * * SUN,WED,THU", now)
+            assert pycron.is_now("* * * * SUNDAY,WEDNESDAY,THURSDAY", now)
+            assert pycron.is_now("* * * * WED", now) is False
+            assert pycron.is_now("* * * * WEDNESDAY", now) is False
+            assert pycron.is_now("* * * * */WED", now) is False
+            assert pycron.is_now("* * * * */WEDNESDAY", now) is False
+            assert pycron.is_now("* * * * SUN,WED,SAT", now) is False
+
         now = datetime(2015, 6, 18, 16, 7)
         run(now)
         run(now.replace(tzinfo=utc))