diff --git a/src/kaleidoscope/MatrixAddr.h b/src/kaleidoscope/MatrixAddr.h
index f5aa07c7..78de9575 100644
--- a/src/kaleidoscope/MatrixAddr.h
+++ b/src/kaleidoscope/MatrixAddr.h
@@ -47,7 +47,7 @@ class MatrixAddr {
   constexpr MatrixAddr(uint8_t row, uint8_t col)
     : offset_(row * cols + col) {}
 
-  explicit constexpr MatrixAddr(uint8_t offset)
+  constexpr MatrixAddr(uint8_t offset)
     : offset_(offset) {}
 
   // Rely on the default copy and move constructor.
@@ -57,8 +57,8 @@ class MatrixAddr {
   //       ridiculously bad assembler code for each copy construction,
   //       that would bloat the default firmware by 1K of PROGMEM!
   //
-  explicit constexpr MatrixAddr(const ThisType &other) = default;
-  explicit constexpr MatrixAddr(ThisType &&other) = default;
+  constexpr MatrixAddr(const ThisType &other) = default;
+  constexpr MatrixAddr(ThisType &&other) = default;
   //constexpr MatrixAddr(const ThisType &other) : offset_(other.offset_) {}
   //constexpr MatrixAddr(ThisType &&other) : offset_(other.offset_) {}
 
diff --git a/src/kaleidoscope/bitfields.h b/src/kaleidoscope/bitfields.h
index 52621143..3a59c854 100644
--- a/src/kaleidoscope/bitfields.h
+++ b/src/kaleidoscope/bitfields.h
@@ -113,7 +113,7 @@ class Bitfield : public internal::_BaseBitfield {
   static constexpr size_t n_bytes_ = nBytesForBits(BitCount__);
 
   template<typename ... Bits__>
-  explicit constexpr Bitfield(Bits__...bits) : bits_(bits...) {
+  constexpr Bitfield(Bits__...bits) : bits_(bits...) {
     static_assert(sizeof...(Bits__) == n_bits_,
                   "Invalid number of bits supplied to Bitfield<BitCount__> constructor. \n"
                   "Compare the number of bits supplied with the provided template \n"
diff --git a/src/kaleidoscope/key_defs.h b/src/kaleidoscope/key_defs.h
index 8a7de806..cca19bf3 100644
--- a/src/kaleidoscope/key_defs.h
+++ b/src/kaleidoscope/key_defs.h
@@ -36,7 +36,7 @@ class Key {
 
   Key() = default;
 
-  explicit constexpr Key(uint16_t raw)
+  constexpr Key(uint16_t raw)
     : Key{(uint8_t)(raw & 0x00FF), (uint8_t)(raw >> 8)}
   {}
 
@@ -140,7 +140,7 @@ class Key {
 
     DataProxy() = default;
 
-    explicit constexpr DataProxy(uint8_t value) : value_{value} {}
+    constexpr DataProxy(uint8_t value) : value_{value} {}
 
     DEPRECATED(DIRECT_KEY_MEMBER_ACCESS)
     DataProxy &operator=(uint8_t value) {