diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 2a42090ddc..9d774ca0a1 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -1200,7 +1200,7 @@ else()
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-cast-function-type>
         $<$<CXX_COMPILER_ID:Clang>:-fsized-deallocation>)
     # pre-clang19 will spam with "OH DID YOU MEAN THIS?" otherwise...
-    if (CXX_CLANG AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19)
+    if (CXX_CLANG AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 20)
         target_compile_options(core PRIVATE $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-cast-function-type-mismatch>)
     endif()
 endif()