diff --git a/english.d b/english.d
index e79225a..2523ce7 100644
--- a/english.d
+++ b/english.d
@@ -49,34 +49,34 @@ string numberToEnglish(long number) {
 				if(number)
 					word ~= "-";
 			}
-		} else if(number < 1000) {
+		} else if(number < 1_000) {
 			auto hundreds = number / 100;
 			word ~= onesPlaceWords[cast(int) hundreds] ~ " hundred";
 			number = number % 100;
 			if(number)
 				word ~= " and ";
-		} else if(number < 1000000) {
-			auto thousands = number / 1000;
+		} else if(number < 1_000_000) {
+			auto thousands = number / 1_000;
 			word ~= numberToEnglish(thousands) ~ " thousand";
-			number = number % 1000;
+			number = number % 1_000;
 			if(number)
 				word ~= ", ";
 		} else if(number < 1_000_000_000) {
-			auto millions = number / 1000000;
+			auto millions = number / 1_000_000;
 			word ~= numberToEnglish(millions) ~ " million";
-			number = number % 1000000;
+			number = number % 1_000_000;
 			if(number)
 				word ~= ", ";
 		} else if(number < 1_000_000_000_000) {
-			auto n = number / 1000000000;
+			auto n = number / 1_000_000_000;
 			word ~= numberToEnglish(n) ~ " billion";
-			number = number % 1000000000;
+			number = number % 1_000_000_000;
 			if(number)
 				word ~= ", ";
 		} else if(number < 1_000_000_000_000_000) {
-			auto n = number / 1000000000000;
+			auto n = number / 1_000_000_000_000;
 			word ~= numberToEnglish(n) ~ " trillion";
-			number = number % 1000000000000;
+			number = number % 1_000_000_000_000;
 			if(number)
 				word ~= ", ";
 		} else {