diff --git a/core/base/src/TColorGradient.cxx b/core/base/src/TColorGradient.cxx
index 74c1f4bba761a..bc53c419b9700 100644
--- a/core/base/src/TColorGradient.cxx
+++ b/core/base/src/TColorGradient.cxx
@@ -111,6 +111,12 @@ void TColorGradient::ResetColor(UInt_t nPoints, const Double_t *points,
    fColors.assign(colors, colors + nPoints * 4);
 
    Double_t sum[4] = { 0., 0., 0., 0. };
+#ifdef __clang__
+   // Clang vectoriser bug (confirmed for clang 20 - 22)
+   // https://github.com/llvm/llvm-project/issues/194008
+   // The store in the loop can smash the stack with e.g. -O2 -mavx2.
+#pragma clang loop vectorize(disable)
+#endif
    for (unsigned n = 0; n < fColors.size(); ++n)
       sum[n % 4] += fColors[n];
 
diff --git a/tutorials/CMakeLists.txt b/tutorials/CMakeLists.txt
index 568ef9662e338..c3fa6ca37c95c 100644
--- a/tutorials/CMakeLists.txt
+++ b/tutorials/CMakeLists.txt
@@ -743,13 +743,6 @@ foreach(t ${tutorials})
   if(${t} IN_LIST multithreaded)
     set_tests_properties(tutorial-${tname} PROPERTIES PROCESSORS ${NProcessors})
   endif()
-
-  if(CMAKE_SYSTEM_NAME MATCHES "Darwin" AND CMAKE_HOST_SYSTEM_VERSION VERSION_GREATER_EQUAL 25.4 AND tname MATCHES "gl-.*grad")
-    # ROOT-21367
-    # On mac beta, there is a stack corruption (suspected to be a compiler bug) that may fail these tests
-    set_tests_properties(tutorial-${tname} PROPERTIES DISABLED True)
-    message(NOTICE "Disabling tutorial ${tname} for mac beta")
-  endif()
 endforeach()
 
 #---Loop over all MPI tutorials and define the corresponding test---------