diff --git a/include/etl/alignment.h b/include/etl/alignment.h
index a24bf23b..f7a258f2 100644
--- a/include/etl/alignment.h
+++ b/include/etl/alignment.h
@@ -184,7 +184,7 @@ namespace etl
         return reinterpret_cast<const T*>(data);
       }
 
-#if ETL_CPP11_SUPPORTED
+#if ETL_CPP11_SUPPORTED && !defined(ETL_COMPILER_ARM5)
       alignas(ALIGNMENT) char data[LENGTH];
 #else
       union
diff --git a/include/etl/type_traits.h b/include/etl/type_traits.h
index 23728d8b..3757f6b7 100644
--- a/include/etl/type_traits.h
+++ b/include/etl/type_traits.h
@@ -751,7 +751,7 @@ namespace etl
   //***************************************************************************
   /// Alignment templates.
   /// These require compiler specific intrinsics.
-#if ETL_CPP11_SUPPORTED
+#if ETL_CPP11_SUPPORTED && !defined(ETL_COMPILER_ARM5)
   template <typename T> struct alignment_of : integral_constant<size_t, alignof(T)> { };
 #elif ETL_COMPILER_MICROSOFT
   template <typename T> struct alignment_of : integral_constant<size_t, size_t(__alignof(T))> {};