diff --git a/stdx/d/lexer.d b/stdx/d/lexer.d
index 7c53ae3..6f03fd3 100644
--- a/stdx/d/lexer.d
+++ b/stdx/d/lexer.d
@@ -716,7 +716,7 @@ public struct DLexer(R)
 			case '.':
 				if (foundDot)
 					break decimalLoop;
-				auto lookahead = range.lookahead(1);
+				auto lookahead = range.lookahead(2);
 				if (lookahead.length == 1 && lookahead[0] == '.')
 					break decimalLoop;
 				else