diff --git a/Externals/poco/Foundation/Foundation.vcxproj b/Externals/poco/Foundation/Foundation.vcxproj
index 708abea062f..168de2f1d64 100644
--- a/Externals/poco/Foundation/Foundation.vcxproj
+++ b/Externals/poco/Foundation/Foundation.vcxproj
@@ -522,7 +522,6 @@
     <ClCompile Include="src\UTF32Encoding.cpp">
       <ExcludedFromBuild>true</ExcludedFromBuild>
     </ClCompile>
-    <ClCompile Include="src\utf8proc.c" />
     <ClCompile Include="src\Void.cpp">
       <ExcludedFromBuild>true</ExcludedFromBuild>
     </ClCompile>
diff --git a/Externals/poco/Foundation/Foundation.vcxproj.filters b/Externals/poco/Foundation/Foundation.vcxproj.filters
index c52bcbb5f01..821d179768a 100644
--- a/Externals/poco/Foundation/Foundation.vcxproj.filters
+++ b/Externals/poco/Foundation/Foundation.vcxproj.filters
@@ -529,7 +529,6 @@
       <Filter>RegularExpression\PCRE Source Files</Filter>
     </ClCompile>
     <ClCompile Include="src\Foundation.cpp" />
-    <ClCompile Include="src\utf8proc.c" />
     <ClCompile Include="src\pcre2_chkdint.c">
       <Filter>RegularExpression\PCRE Source Files</Filter>
     </ClCompile>
diff --git a/Externals/poco/Foundation/src/Foundation.cpp b/Externals/poco/Foundation/src/Foundation.cpp
index 49880366574..d61c56364fc 100644
--- a/Externals/poco/Foundation/src/Foundation.cpp
+++ b/Externals/poco/Foundation/src/Foundation.cpp
@@ -63,7 +63,6 @@
 #include "Unicode.cpp"
 #include "UnicodeConverter.cpp"
 #include "UTF8Encoding.cpp"
-#include "UTF8String.cpp"
 #include "UTF16Encoding.cpp"
 #include "UTF32Encoding.cpp"
 #include "Windows1250Encoding.cpp"