diff --git a/3rdparty/openexr/CMakeLists.txt b/3rdparty/openexr/CMakeLists.txt
index aeb5a55f31..01a6601165 100644
--- a/3rdparty/openexr/CMakeLists.txt
+++ b/3rdparty/openexr/CMakeLists.txt
@@ -110,6 +110,7 @@ ocv_warnings_disable(CMAKE_CXX_FLAGS -Wshadow -Wunused -Wsign-compare -Wundef -W
                                      -Wreorder
                                      -Wunused-result
                                      -Wimplicit-const-int-float-conversion  # clang
+                                     -Wno-nontrivial-memcall # for clang 21
 )
 if(CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 8.0)
   ocv_warnings_disable(CMAKE_CXX_FLAGS -Wclass-memaccess)