diff --git a/CMakeLists.txt b/CMakeLists.txt
index 39bd25be8..760797948 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -249,6 +249,9 @@ if(WIN32)
     if(MSVC)
         # BOOST_ALL_NO_LIB: Avoid the automatic linking of Boost libraries on Windows. Rather rely on explicit linking.
         add_definitions(-DBOOST_ALL_NO_LIB -DBOOST_USE_WINAPI_VERSION=0x601 -DBOOST_SYSTEM_USE_UTF8 )
+        # Force the source code encoding to UTF-8. See PrusaSlicer GH pull request #5583
+        add_compile_options("$<$<C_COMPILER_ID:MSVC>:/utf-8>")
+        add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")
     endif(MSVC)
 endif(WIN32)