diff --git a/src/Data/ByteArray/Builder.hs b/src/Data/ByteArray/Builder.hs
index 6e5ade5..65364c2 100644
--- a/src/Data/ByteArray/Builder.hs
+++ b/src/Data/ByteArray/Builder.hs
@@ -32,6 +32,7 @@ module Data.ByteArray.Builder
   , word32Dec
   , word16Dec
   , word8Dec
+  , wordDec
   , int64Dec
   , int32Dec
   , int16Dec
@@ -282,6 +283,12 @@ word16Dec w = fromBounded Nat.constant (Bounded.word16Dec w)
 word8Dec :: Word8 -> Builder
 word8Dec w = fromBounded Nat.constant (Bounded.word8Dec w)
 
+-- | Encodes an unsigned machine-sized integer as decimal.
+-- This encoding never starts with a zero unless the
+-- argument was zero.
+wordDec :: Word -> Builder
+wordDec w = fromBounded Nat.constant (Bounded.wordDec w)
+
 -- | Encode a double-floating-point number, using decimal notation or
 -- scientific notation depending on the magnitude. This has undefined
 -- behavior when representing @+inf@, @-inf@, and @NaN@. It will not
diff --git a/src/Data/ByteArray/Builder/Bounded.hs b/src/Data/ByteArray/Builder/Bounded.hs
index 0450234..ecb983d 100644
--- a/src/Data/ByteArray/Builder/Bounded.hs
+++ b/src/Data/ByteArray/Builder/Bounded.hs
@@ -29,6 +29,7 @@ module Data.ByteArray.Builder.Bounded
   , word32Dec
   , word16Dec
   , word8Dec
+  , wordDec
   , int64Dec
   , int32Dec
   , int16Dec
@@ -162,6 +163,12 @@ word16Dec (W16# w) = wordCommonDec# w
 word8Dec :: Word8 -> Builder 3
 word8Dec (W8# w) = wordCommonDec# w
 
+-- | Requires up to 19 bytes. Encodes an unsigned machine-sized integer
+-- as decimal. This encoding never starts with a zero unless the argument
+-- was zero.
+wordDec :: Word -> Builder 19
+wordDec (W# w) = wordCommonDec# w
+
 -- | Requires up to 20 bytes. Encodes a signed 64-bit integer as decimal.
 -- This encoding never starts with a zero unless the argument was zero.
 -- Negative numbers are preceded by a minus sign. Positive numbers