diff --git a/bin/csharp-petstore.sh b/bin/csharp-petstore.sh
index 15b80bc71f7c..a82efa9af108 100755
--- a/bin/csharp-petstore.sh
+++ b/bin/csharp-petstore.sh
@@ -26,6 +26,6 @@ fi
 
 # if you've executed sbt assembly previously it will use that instead.
 export JAVA_OPTS="${JAVA_OPTS} -XX:MaxPermSize=256M -Xmx1024M -DloggerPath=conf/log4j.properties"
-ags="$@ generate -i modules/swagger-codegen/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml -l csharp -o samples/client/petstore/csharp/SwaggerClient -DoptionalProjectFile=true"
+ags="$@ generate -i modules/swagger-codegen/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml -l csharp -o samples/client/petstore/csharp/SwaggerClient"
 
 java $JAVA_OPTS -jar $executable $ags
diff --git a/bin/windows/csharp-petstore.bat b/bin/windows/csharp-petstore.bat
index 29338524c020..fbfc18d334d5 100755
--- a/bin/windows/csharp-petstore.bat
+++ b/bin/windows/csharp-petstore.bat
@@ -5,6 +5,6 @@ If Not Exist %executable% (
 )
 
 set JAVA_OPTS=%JAVA_OPTS% -XX:MaxPermSize=256M -Xmx1024M -DloggerPath=conf/log4j.properties
-set ags=generate -t modules\swagger-codegen\src\main\resources\csharp -i modules\swagger-codegen\src\test\resources\2_0\petstore.json -l csharp -o samples\client\petstore\csharp\SwaggerClient -DoptionalProjectFile=true
+set ags=generate -t modules\swagger-codegen\src\main\resources\csharp -i modules\swagger-codegen\src\test\resources\2_0\petstore.json -l csharp -o samples\client\petstore\csharp\SwaggerClient
 
 java %JAVA_OPTS% -jar %executable% %ags%
diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractCSharpCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractCSharpCodegen.java
index cd9bbc728fc8..b2ae82544f58 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractCSharpCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractCSharpCodegen.java
@@ -12,7 +12,7 @@ import java.util.*;
 public abstract class AbstractCSharpCodegen extends DefaultCodegen implements CodegenConfig {
 
     protected boolean optionalAssemblyInfoFlag = true;
-    protected boolean optionalProjectFileFlag = false;
+    protected boolean optionalProjectFileFlag = true;
     protected boolean optionalEmitDefaultValue = false;
     protected boolean optionalMethodArgumentFlag = true;
     protected boolean useDateTimeOffsetFlag = false;