diff --git a/src/multimap.h b/src/multimap.h
index 016a4513..1d2e7682 100644
--- a/src/multimap.h
+++ b/src/multimap.h
@@ -178,9 +178,12 @@ namespace etl
 
   protected:
 
-    static const uint_least8_t kLeft = 0;
-    static const uint_least8_t kRight = 1;
-    static const uint_least8_t kNeither = 2;
+    enum
+    {
+      kLeft,
+      kRight,
+      kNeither
+    };
 
     //*************************************************************************
     /// The node element in the multimap.
diff --git a/src/multiset.h b/src/multiset.h
index e01e1d59..d2911291 100644
--- a/src/multiset.h
+++ b/src/multiset.h
@@ -178,9 +178,12 @@ namespace etl
 
   protected:
 
-    static const uint_least8_t kLeft = 0;
-    static const uint_least8_t kRight = 1;
-    static const uint_least8_t kNeither = 2;
+    enum
+    {
+      kLeft,
+      kRight,
+      kNeither
+    };
 
     //*************************************************************************
     /// The node element in the multiset.