diff --git a/lib/Data/Int/Instances.hs b/lib/Data/Int/Instances.hs
index 905c3d77..30fb7961 100644
--- a/lib/Data/Int/Instances.hs
+++ b/lib/Data/Int/Instances.hs
@@ -54,8 +54,8 @@ instance Integral Int8 where
   toInteger = _intToInteger . unI8
 
 instance Bounded Int8 where
-  minBound = I8 0x80
-  maxBound = I8 0x7f
+  minBound = i8 0x80
+  maxBound = i8 0x7f
 
 instance Real Int8 where
   toRational = _integerToRational . _intToInteger . unI8
@@ -150,8 +150,8 @@ instance Integral Int16 where
   toInteger = _intToInteger . unI16
 
 instance Bounded Int16 where
-  minBound = I16 0x8000
-  maxBound = I16 0x7fff
+  minBound = i16 0x8000
+  maxBound = i16 0x7fff
 
 instance Real Int16 where
   toRational = _integerToRational . _intToInteger . unI16
@@ -246,8 +246,8 @@ instance Integral Int32 where
   toInteger = _intToInteger . unI32
 
 instance Bounded Int32 where
-  minBound = I32 0x80000000
-  maxBound = I32 0x7fffffff
+  minBound = i32 0x80000000
+  maxBound = i32 0x7fffffff
 
 instance Real Int32 where
   toRational = _integerToRational . _intToInteger . unI32
@@ -341,8 +341,8 @@ instance Integral Int64 where
   toInteger = _intToInteger . unI64
 
 instance Bounded Int64 where
-  minBound = I64 0x8000000000000000
-  maxBound = I64 0x7fffffffffffffff
+  minBound = i64 0x8000000000000000
+  maxBound = i64 0x7fffffffffffffff
 
 instance Real Int64 where
   toRational = _integerToRational . _intToInteger . unI64
diff --git a/lib/Data/Word.hs b/lib/Data/Word.hs
index 45f7566d..a67e70d6 100644
--- a/lib/Data/Word.hs
+++ b/lib/Data/Word.hs
@@ -141,8 +141,8 @@ instance Integral Word8 where
   toInteger = _wordToInteger . unW8
 
 instance Bounded Word8 where
-  minBound = W8 0
-  maxBound = W8 0xff
+  minBound = w8 0
+  maxBound = w8 0xff
 
 instance Real Word8 where
   toRational = _integerToRational . _wordToInteger . unW8
@@ -239,8 +239,8 @@ instance Integral Word16 where
   toInteger = _wordToInteger . unW16
 
 instance Bounded Word16 where
-  minBound = W16 0
-  maxBound = W16 0xffff
+  minBound = w16 0
+  maxBound = w16 0xffff
 
 instance Real Word16 where
   toRational = _integerToRational . _wordToInteger . unW16
@@ -336,8 +336,8 @@ instance Integral Word32 where
   toInteger = _wordToInteger . unW32
 
 instance Bounded Word32 where
-  minBound = W32 0
-  maxBound = W32 0xffffffff
+  minBound = w32 0
+  maxBound = w32 0xffffffff
 
 instance Real Word32 where
   toRational = _integerToRational . _wordToInteger . unW32
@@ -434,8 +434,8 @@ instance Integral Word64 where
   toInteger = _wordToInteger . unW64
 
 instance Bounded Word64 where
-  minBound = W64 0
-  maxBound = W64 0xffffffffffffffff
+  minBound = w64 0
+  maxBound = w64 0xffffffffffffffff
 
 instance Real Word64 where
   toRational = _integerToRational . _wordToInteger . unW64
diff --git a/tests/Bounded.hs b/tests/Bounded.hs
new file mode 100644
index 00000000..537d60bb
--- /dev/null
+++ b/tests/Bounded.hs
@@ -0,0 +1,16 @@
+module Bounded where
+
+import Data.Int
+import Data.Word
+
+printBounds :: forall a. (Bounded a, Show a) => IO ()
+printBounds = print (minBound @a, maxBound @a)
+
+main :: IO ()
+main = do
+  printBounds @Int8
+  printBounds @Int16
+  printBounds @Int32
+  printBounds @Word8
+  printBounds @Word16
+  printBounds @Word32
diff --git a/tests/Bounded.ref b/tests/Bounded.ref
new file mode 100644
index 00000000..9586962d
--- /dev/null
+++ b/tests/Bounded.ref
@@ -0,0 +1,6 @@
+(-128,127)
+(-32768,32767)
+(-2147483648,2147483647)
+(0,255)
+(0,65535)
+(0,4294967295)