diff --git a/src/main/java/com/kobylynskyi/graphql/codegen/kotlin/KotlinGraphQLTypeMapper.java b/src/main/java/com/kobylynskyi/graphql/codegen/kotlin/KotlinGraphQLTypeMapper.java
index 524c1694aa7dfb837ad30174e236a3306366a975..75d834d5d9936104271f84fb9ae1377b7ad91c40 100644
--- a/src/main/java/com/kobylynskyi/graphql/codegen/kotlin/KotlinGraphQLTypeMapper.java
+++ b/src/main/java/com/kobylynskyi/graphql/codegen/kotlin/KotlinGraphQLTypeMapper.java
@@ -50,7 +50,7 @@ public class KotlinGraphQLTypeMapper implements GraphQLTypeMapper {
             case "Float":
                 return "0F";
             case "Double":
-                return "0D";
+                return "0.0";
             case "Char":
                 return "0.toChar()";
             case "Boolean":