diff --git a/src/DynamicExpresso.Core/Detector.cs b/src/DynamicExpresso.Core/Detector.cs
index a315125..77a8191 100644
--- a/src/DynamicExpresso.Core/Detector.cs
+++ b/src/DynamicExpresso.Core/Detector.cs
@@ -76,9 +76,18 @@ public IdentifiersInfo DetectIdentifiers(string expression)
 				if (IsReservedKeyword(identifier))
 					continue;
 
-				// don't consider member accesses as identifiers (e.g. "x.Length" will only return x but not Length)
-				if (idGroup.Index > 0 && expression[idGroup.Index - 1] == '.')
-					continue;
+				if (idGroup.Index > 0)
+				{
+					var previousChar = expression[idGroup.Index - 1];
+
+					// don't consider member accesses as identifiers (e.g. "x.Length" will only return x but not Length)
+					if (previousChar == '.')
+						continue;
+
+					// don't consider number literals as identifiers
+					if (char.IsDigit(previousChar))
+						continue;
+				}
 
 				if (_settings.Identifiers.TryGetValue(identifier, out Identifier knownIdentifier))
 					knownIdentifiers.Add(knownIdentifier);
diff --git a/test/DynamicExpresso.UnitTest/DetectIdentifiersTest.cs b/test/DynamicExpresso.UnitTest/DetectIdentifiersTest.cs
index 27e8374..99d91f2 100644
--- a/test/DynamicExpresso.UnitTest/DetectIdentifiersTest.cs
+++ b/test/DynamicExpresso.UnitTest/DetectIdentifiersTest.cs
@@ -324,5 +324,22 @@ public void Dont_detect_members_with_at()
 			Assert.AreEqual(1, detectedIdentifiers.UnknownIdentifiers.Count());
 			Assert.AreEqual("@class", detectedIdentifiers.UnknownIdentifiers.ElementAt(0));
 		}
+
+
+		[Test]
+		[TestCase("1L")]
+		[TestCase("2M")]
+		[TestCase("3.0D")]
+		[TestCase("4.0F")]
+		[TestCase("6.7e-8")]
+		[TestCase("9U")]
+		[TestCase("10ul")]
+		[TestCase("11lu")]
+		public void Dont_detect_numbers_with_suffix(string code)
+		{
+			var target = new Interpreter(InterpreterOptions.Default | InterpreterOptions.LambdaExpressions);
+			var detectedIdentifiers = target.DetectIdentifiers(code);
+			Assert.IsEmpty(detectedIdentifiers.UnknownIdentifiers);
+		}
 	}
 }