diff --git a/quickcheck/CHANGELOG.md b/quickcheck/CHANGELOG.md
index 2d2eaff2..21915482 100644
--- a/quickcheck/CHANGELOG.md
+++ b/quickcheck/CHANGELOG.md
@@ -5,6 +5,7 @@ Version 0.11.1
 --------------
 
 * Add timeouts for individual tests within a property.
+* Define `showDefaultValue` for `QuickCheckTests`, `QuickCheckMaxSize` and `QuickCheckMaxRatio`.
 
 Version 0.11
 --------------
diff --git a/quickcheck/Test/Tasty/QuickCheck.hs b/quickcheck/Test/Tasty/QuickCheck.hs
index fa1a5b15..a3057dda 100644
--- a/quickcheck/Test/Tasty/QuickCheck.hs
+++ b/quickcheck/Test/Tasty/QuickCheck.hs
@@ -127,6 +127,7 @@ newtype QuickCheckTimeout = QuickCheckTimeout Timeout
 
 instance IsOption QuickCheckTests where
   defaultValue = 100
+  showDefaultValue (QuickCheckTests n) = Just (show n)
   parseValue =
     -- We allow numeric underscores for readability; see
     -- https://github.com/UnkindPartition/tasty/issues/263
@@ -156,6 +157,7 @@ defaultMaxSize = QC.maxSize QC.stdArgs
 
 instance IsOption QuickCheckMaxSize where
   defaultValue = fromIntegral defaultMaxSize
+  showDefaultValue (QuickCheckMaxSize n) = Just (show n)
   parseValue = fmap QuickCheckMaxSize . safeRead
   optionName = return "quickcheck-max-size"
   optionHelp = return "Size of the biggest test cases quickcheck generates"
@@ -163,6 +165,7 @@ instance IsOption QuickCheckMaxSize where
 
 instance IsOption QuickCheckMaxRatio where
   defaultValue = fromIntegral $ QC.maxDiscardRatio QC.stdArgs
+  showDefaultValue (QuickCheckMaxRatio n) = Just (show n)
   parseValue = fmap QuickCheckMaxRatio . safeRead
   optionName = return "quickcheck-max-ratio"
   optionHelp = return "Maximum number of discared tests per successful test before giving up"