diff --git a/libs/spandsp/src/libspandsp.2008.vcproj b/libs/spandsp/src/libspandsp.2008.vcproj
index d5964ec4d6..9793cc6f61 100644
--- a/libs/spandsp/src/libspandsp.2008.vcproj
+++ b/libs/spandsp/src/libspandsp.2008.vcproj
@@ -1243,7 +1243,11 @@
 				>
 			</File>
 			<File
-				RelativePath=".\spandsp\t81_t82_arith_coding.h"
+				RelativePath=".\spandsp\private\t42.h"
+				>
+			</File>
+			<File
+				RelativePath=".\spandsp\t42.h"
 				>
 			</File>
 			<File
@@ -1251,13 +1255,17 @@
 				>
 			</File>
 			<File
-				RelativePath=".\spandsp\t85.h"
+				RelativePath=".\spandsp\t81_t82_arith_coding.h"
 				>
 			</File>
 			<File
 				RelativePath=".\spandsp\private\t85.h"
 				>
 			</File>
+			<File
+				RelativePath=".\spandsp\t85.h"
+				>
+			</File>
 		</Filter>
 		<File
 			RelativePath=".\msvc\spandsp.h"
diff --git a/libs/spandsp/src/libspandsp.2010.vcxproj b/libs/spandsp/src/libspandsp.2010.vcxproj
index 398b5dc7e0..2c933c77a5 100644
--- a/libs/spandsp/src/libspandsp.2010.vcxproj
+++ b/libs/spandsp/src/libspandsp.2010.vcxproj
@@ -287,6 +287,7 @@
     <ClInclude Include="spandsp\plc.h" />
     <ClInclude Include="spandsp\power_meter.h" />
     <ClInclude Include="spandsp\private\ademco_contactid.h" />
+    <ClInclude Include="spandsp\private\t42.h" />
     <ClInclude Include="spandsp\private\t81_t82_arith_coding.h" />
     <ClInclude Include="spandsp\private\t85.h" />
     <ClInclude Include="spandsp\queue.h" />
@@ -297,6 +298,7 @@
     <ClInclude Include="spandsp\super_tone_rx.h" />
     <ClInclude Include="spandsp\super_tone_tx.h" />
     <ClInclude Include="spandsp\swept_tone.h" />
+    <ClInclude Include="spandsp\t42.h" />
     <ClInclude Include="spandsp\t4_rx.h" />
     <ClInclude Include="spandsp\t4_tx.h" />
     <ClInclude Include="spandsp\t4_t6_decode.h" />
diff --git a/libs/spandsp/src/libspandsp.2010.vcxproj.filters b/libs/spandsp/src/libspandsp.2010.vcxproj.filters
index fef56df81d..d79f7d1201 100644
--- a/libs/spandsp/src/libspandsp.2010.vcxproj.filters
+++ b/libs/spandsp/src/libspandsp.2010.vcxproj.filters
@@ -701,6 +701,12 @@
     <ClInclude Include="spandsp\t85.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="spandsp\t42.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="spandsp\private\t42.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <CustomBuild Include="msvc\spandsp.h" />
diff --git a/libs/spandsp/src/msvc/spandsp.h b/libs/spandsp/src/msvc/spandsp.h
index f6d7f0cd3b..6ba0b82cec 100644
--- a/libs/spandsp/src/msvc/spandsp.h
+++ b/libs/spandsp/src/msvc/spandsp.h
@@ -110,9 +110,7 @@
 #include <spandsp/t4_t6_encode.h>
 #include <spandsp/t81_t82_arith_coding.h>
 #include <spandsp/t85.h>
-#if defined(SPANDSP_SUPPORT_T42)
 #include <spandsp/t42.h>
-#endif
 #if defined(SPANDSP_SUPPORT_T43)
 #include <spandsp/t43.h>
 #endif