diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractJavaCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractJavaCodegen.java
index e510994a74a..13310ecc5c3 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractJavaCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractJavaCodegen.java
@@ -1000,9 +1000,11 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
 
     @Override
     public String toEnumValue(String value, String datatype) {
-        if ("Integer".equals(datatype) || "Long".equals(datatype) ||
-            "Double".equals(datatype)) {
+        if ("Integer".equals(datatype) || "Double".equals(datatype)) {
             return value;
+        } else if ("Long".equals(datatype)) {
+            // add l to number, e.g. 2048 => 2048l
+            return value + "l";
         } else if ("Float".equals(datatype)) {
             // add f to number, e.g. 3.14 => 3.14f
             return value + "f";