diff --git a/wadsrc/CMakeLists.txt b/wadsrc/CMakeLists.txt
index f66bf14e8..f78789644 100644
--- a/wadsrc/CMakeLists.txt
+++ b/wadsrc/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required( VERSION 2.4 )
 
 	
 add_custom_command( OUTPUT ${ZDOOM_OUTPUT_DIR}/zdoom.pk3
-   COMMAND ${CMAKE_BINARY_DIR}/tools/zipdir/zipdir -uf ${ZDOOM_OUTPUT_DIR}/zdoom.pk3 ${CMAKE_CURRENT_SOURCE_DIR}/static ${CMAKE_CURRENT_BINARY_DIR}/generated
+   COMMAND ${CMAKE_BINARY_DIR}/tools/zipdir/zipdir -udf ${ZDOOM_OUTPUT_DIR}/zdoom.pk3 ${CMAKE_CURRENT_SOURCE_DIR}/static ${CMAKE_CURRENT_BINARY_DIR}/generated
    DEPENDS zipdir ${CMAKE_CURRENT_SOURCE_DIR}/static )
 	
 add_custom_target( pk3 ALL
diff --git a/wadsrc/wadsrc.vcproj b/wadsrc/wadsrc.vcproj
index 0fd088149..a79a19c5b 100644
--- a/wadsrc/wadsrc.vcproj
+++ b/wadsrc/wadsrc.vcproj
@@ -81,7 +81,7 @@
 			<Tool
 				Name="VCPostBuildEventTool"
 				Description="Checking zdoom.pk3..."
-				CommandLine="&quot;$(SolutionDir)tools\zipdir\zipdir.exe&quot; -u &quot;$(InputDir)zdoom.pk3&quot; &quot;$(InputDir)static&quot; &quot;$(InputDir)generated&quot;&#x0D;&#x0A;copy &quot;$(InputDir)zdoom.pk3&quot; &quot;$(SolutionDir)..\zdoom.pk3&quot;&#x0D;&#x0A;"
+				CommandLine="&quot;$(SolutionDir)tools\zipdir\zipdir.exe&quot; -ud &quot;$(InputDir)zdoom.pk3&quot; &quot;$(InputDir)static&quot; &quot;$(InputDir)generated&quot;&#x0D;&#x0A;copy &quot;$(InputDir)zdoom.pk3&quot; &quot;$(SolutionDir)..\zdoom.pk3&quot;&#x0D;&#x0A;"
 			/>
 		</Configuration>
 		<Configuration
@@ -103,7 +103,7 @@
 			<Tool
 				Name="VCPostBuildEventTool"
 				Description="Checking zdoom.pk3..."
-				CommandLine="&quot;$(SolutionDir)tools\zipdir\zipdir.exe&quot; -u &quot;$(InputDir)zdoom.pk3&quot; &quot;$(InputDir)static&quot; &quot;$(InputDir)generated&quot;&#x0D;&#x0A;copy &quot;$(InputDir)zdoom.pk3&quot; &quot;$(SolutionDir)..\zdoom.pk3&quot;&#x0D;&#x0A;"
+				CommandLine="&quot;$(SolutionDir)tools\zipdir\zipdir.exe&quot; -ud &quot;$(InputDir)zdoom.pk3&quot; &quot;$(InputDir)static&quot; &quot;$(InputDir)generated&quot;&#x0D;&#x0A;copy &quot;$(InputDir)zdoom.pk3&quot; &quot;$(SolutionDir)..\zdoom.pk3&quot;&#x0D;&#x0A;"
 			/>
 		</Configuration>
 	</Configurations>