diff --git a/Visual Studio Projects/PDP11.vcproj b/Visual Studio Projects/PDP11.vcproj
index fc4f4b67..ef31b431 100644
--- a/Visual Studio Projects/PDP11.vcproj	
+++ b/Visual Studio Projects/PDP11.vcproj	
@@ -396,10 +396,6 @@
 			Name="Header Files"
 			Filter="h;hpp;hxx;hm;inl;inc"
 			>
-			<File
-				RelativePath="..\dec_dz.h"
-				>
-			</File>
 			<File
 				RelativePath="..\PDP11\pdp11_cpumod.h"
 				>
diff --git a/Visual Studio Projects/VAX.vcproj b/Visual Studio Projects/VAX.vcproj
index 3aaebaa1..4e30884e 100644
--- a/Visual Studio Projects/VAX.vcproj	
+++ b/Visual Studio Projects/VAX.vcproj	
@@ -361,10 +361,6 @@
 			Name="Header Files"
 			Filter="h;hpp;hxx;hm;inl;inc"
 			>
-			<File
-				RelativePath="..\PDP11\dec_dz.h"
-				>
-			</File>
 			<File
 				RelativePath="..\PDP11\pdp11_io_lib.h"
 				>
diff --git a/Visual Studio Projects/VAX780.vcproj b/Visual Studio Projects/VAX780.vcproj
index 52c14deb..d688ef3f 100644
--- a/Visual Studio Projects/VAX780.vcproj	
+++ b/Visual Studio Projects/VAX780.vcproj	
@@ -387,10 +387,6 @@
 			Name="Header Files"
 			Filter="h;hpp;hxx;hm;inl;inc"
 			>
-			<File
-				RelativePath="..\dec_dz.h"
-				>
-			</File>
 			<File
 				RelativePath="..\PDP11\pdp11_io_lib.h"
 				>