diff --git a/test/PhoneNumbers.Tests/PhoneNumber_Parse_Europe_Tests.cs b/test/PhoneNumbers.Tests/PhoneNumber_Parse_Europe_Tests.cs
index c452ec59..e395ac48 100644
--- a/test/PhoneNumbers.Tests/PhoneNumber_Parse_Europe_Tests.cs
+++ b/test/PhoneNumbers.Tests/PhoneNumber_Parse_Europe_Tests.cs
@@ -290,10 +290,12 @@ public void Parse_Value_For_Romania_CallingCode()
         Assert.Equal(CountryInfo.Romania, phoneNumber.Country);
     }
 
-    [Fact]
-    public void Parse_Value_For_SanMarino_CallingCode()
+    [Theory]
+    [InlineData("+378882555")] // San Marino international
+    [InlineData("+3780549882555")] // San Marino country code and the Italian area code
+    public void Parse_Value_For_SanMarino_CallingCode(string value)
     {
-        var phoneNumber = PhoneNumber.Parse("+3780549882555");
+        var phoneNumber = PhoneNumber.Parse(value);
         Assert.NotNull(phoneNumber);
         Assert.Equal(CountryInfo.SanMarino, phoneNumber.Country);
     }