diff --git a/include/etl/limits.h b/include/etl/limits.h
index 9fa86fff..47b10a22 100644
--- a/include/etl/limits.h
+++ b/include/etl/limits.h
@@ -332,6 +332,11 @@ namespace etl
     static ETL_CONSTANT bool is_signed = etl::is_signed<wchar_t>::value;
     static ETL_CONSTANT bool is_modulo = etl::is_unsigned<wchar_t>::value;
 
+#if defined(ETL_COMPILER_CLANG) && defined(CROSS_COMPILING_TO_AVR)
+#undef WCHAR_MIN
+#define WCHAR_MIN (-WCHAR_MAX - 1)
+#endif
+
     static ETL_CONSTEXPR wchar_t min() { return WCHAR_MIN; }
     static ETL_CONSTEXPR wchar_t max() { return WCHAR_MAX; }
     static ETL_CONSTEXPR wchar_t lowest() { return WCHAR_MIN; }
diff --git a/include/etl/profiles/determine_compiler.h b/include/etl/profiles/determine_compiler.h
index b1078588..60f33c61 100644
--- a/include/etl/profiles/determine_compiler.h
+++ b/include/etl/profiles/determine_compiler.h
@@ -75,6 +75,9 @@ SOFTWARE.
     #if defined(__clang__) || defined(__llvm__)
       #define ETL_COMPILER_CLANG
       #define ETL_COMPILER_TYPE_DETECTED
+      #if __AVR__ == 1
+        #define CROSS_COMPILING_TO_AVR
+      #endif
     #endif
   #endif