diff --git a/Marlin/src/core/types.h b/Marlin/src/core/types.h
index 74570ced76..68adadc95d 100644
--- a/Marlin/src/core/types.h
+++ b/Marlin/src/core/types.h
@@ -180,6 +180,8 @@ template <class L, class R> struct IF<true, L, R> { typedef L type; };
 #define uvalue_t(V) typename IF<((V)>65535), uint32_t, typename IF<((V)>255), uint16_t, uint8_t>::type>::type
 #define value_t(V)  typename IF<((V)>32767),  int32_t, typename IF<((V)>127),  int16_t,  int8_t>::type>::type
 
+class BitProxy;
+
 // Define a template for a bit field of N bits, using the smallest type that can hold N bits
 template<size_t N, bool UseArray = (N > 64)>
 struct Flags;
@@ -1018,8 +1020,6 @@ struct XYZEarray {
   FI XYZEval<T> operator[](const int n) const { return XYZval<T>(LOGICAL_AXIS_ARRAY(e[n], x[n], y[n], z[n], i[n], j[n], k[n], u[n], v[n], w[n])); }
 };
 
-class AxisBits;
-
 class AxisBits {
 public:
   typedef bits_t(NUM_AXIS_HEADS) el;