diff --git a/scripts/toolchains/uwp.cmake b/scripts/toolchains/uwp.cmake
index f5f24c16c01180..9d6476b13e4166 100644
--- a/scripts/toolchains/uwp.cmake
+++ b/scripts/toolchains/uwp.cmake
@@ -82,7 +82,7 @@ if(NOT _VCPKG_WINDOWS_TOOLCHAIN)
 
     set(CMAKE_CXX_FLAGS "${_vcpkg_cpp_flags} ${_vcpkg_common_flags} ${_vcpkg_winmd_flag} ${CHARSET_FLAG} ${VCPKG_CXX_FLAGS}" CACHE STRING "")
     set(CMAKE_C_FLAGS "${_vcpkg_cpp_flags} ${_vcpkg_common_flags} ${_vcpkg_winmd_flag} ${CHARSET_FLAG} ${VCPKG_C_FLAGS}" CACHE STRING "")
-    set(CMAKE_RC_FLAGS "-c65001 ${_vcpkg_cpp_flags}" CACHE STRING "")
+    set(CMAKE_RC_FLAGS "/c65001 ${_vcpkg_cpp_flags}" CACHE STRING "")
 
     unset(CHARSET_FLAG)
     unset(MP_BUILD_FLAG)
diff --git a/scripts/toolchains/windows.cmake b/scripts/toolchains/windows.cmake
index 3cc90cc8867454..14ede8e4a65340 100644
--- a/scripts/toolchains/windows.cmake
+++ b/scripts/toolchains/windows.cmake
@@ -82,7 +82,7 @@ if(NOT _VCPKG_WINDOWS_TOOLCHAIN)
         string(APPEND CMAKE_CXX_FLAGS " /arm64EC /D_AMD64_ /DAMD64 /D_ARM64EC_ /DARM64EC")
         string(APPEND CMAKE_C_FLAGS " /arm64EC /D_AMD64_ /DAMD64 /D_ARM64EC_ /DARM64EC")
     endif()
-    set(CMAKE_RC_FLAGS "-c65001 /DWIN32" CACHE STRING "")
+    set(CMAKE_RC_FLAGS "/c65001 /DWIN32" CACHE STRING "")
 
     set(CMAKE_CXX_FLAGS_DEBUG "${VCPKG_CRT_LINK_FLAG_PREFIX}d /Z7 /Ob0 /Od /RTC1 ${VCPKG_CXX_FLAGS_DEBUG}" CACHE STRING "")
     set(CMAKE_C_FLAGS_DEBUG "${VCPKG_CRT_LINK_FLAG_PREFIX}d /Z7 /Ob0 /Od /RTC1 ${VCPKG_C_FLAGS_DEBUG}" CACHE STRING "")
diff --git a/scripts/toolchains/xbox.cmake b/scripts/toolchains/xbox.cmake
index f669a961b2c5eb..eba6eb7397738d 100644
--- a/scripts/toolchains/xbox.cmake
+++ b/scripts/toolchains/xbox.cmake
@@ -160,7 +160,7 @@ if(NOT _VCPKG_WINDOWS_TOOLCHAIN)
 
     set(CMAKE_CXX_FLAGS "${_vcpkg_cpp_flags} ${_vcpkg_common_flags} ${VCPKG_CXX_FLAGS}" CACHE STRING "")
     set(CMAKE_C_FLAGS "${_vcpkg_cpp_flags} ${_vcpkg_common_flags} ${VCPKG_C_FLAGS}" CACHE STRING "")
-    set(CMAKE_RC_FLAGS "-c65001 ${_vcpkg_cpp_flags}" CACHE STRING "")
+    set(CMAKE_RC_FLAGS "/c65001 ${_vcpkg_cpp_flags}" CACHE STRING "")
 
     unset(_vcpkg_cpp_flags)
     unset(_vcpkg_common_flags)