diff --git a/posix-timer.cabal b/posix-timer.cabal
--- a/posix-timer.cabal
+++ b/posix-timer.cabal
@@ -1,5 +1,5 @@
 Name: posix-timer
-Version: 0.2.0.1
+Version: 0.3
 Category: System
 Stability: experimental
 Synopsis: Bindings to POSIX clock and timer functions.
@@ -25,7 +25,7 @@
   Location: https://github.com/mvv/posix-timer.git
 
 Library
-  Build-Depends: base < 5, unix, transformers-base
+  Build-Depends: base < 5, unix, transformers-base >= 0.3
   Hs-Source-Dirs: src
   Include-Dirs: include
   GHC-Options: -Wall
diff --git a/src/System/Posix/Clock.hsc b/src/System/Posix/Clock.hsc
--- a/src/System/Posix/Clock.hsc
+++ b/src/System/Posix/Clock.hsc
@@ -208,35 +208,35 @@
 
 -- | Get the CPU-time clock of the given process.
 --   See /clock_getcpuclockid(3)/.
-getProcessClock ∷ MonadBase μ IO ⇒ ProcessID → μ Clock
+getProcessClock ∷ MonadBase IO μ ⇒ ProcessID → μ Clock
 getProcessClock pid =
   liftBase $ alloca $ \p → do
     throwErrnoIfMinus1_ "getProcClock" $ c_clock_getcpuclockid pid p
     peek p
 
 -- | Get the clock resolution. See /clock_getres(3)/.
-getClockResolution ∷ MonadBase μ IO ⇒ Clock → μ TimeSpec
+getClockResolution ∷ MonadBase IO μ ⇒ Clock → μ TimeSpec
 getClockResolution clock =
   liftBase $ alloca $ \p → do
     throwErrnoIfMinus1_ "getClockResolution" $ c_clock_getres clock p
     peek p
 
 -- | Get the clock time. See /clock_gettime(3)/.
-getClockTime ∷ MonadBase μ IO ⇒ Clock → μ TimeSpec
+getClockTime ∷ MonadBase IO μ ⇒ Clock → μ TimeSpec
 getClockTime clock =
   liftBase $ alloca $ \p → do
     throwErrnoIfMinus1_ "getClockTime" $ c_clock_gettime clock p
     peek p
 
 -- | Set the clock time. See /clock_settime(3)/.
-setClockTime ∷ MonadBase μ IO ⇒ Clock → TimeSpec → μ ()
+setClockTime ∷ MonadBase IO μ ⇒ Clock → TimeSpec → μ ()
 setClockTime clock ts =
   liftBase $ with ts $
     throwErrnoIfMinus1_ "setClockTime" . c_clock_settime clock
 
 -- | Sleep for the specified duration. When interrupted by a signal, returns
 --   the amount of time left to sleep. See /clock_nanosleep(3)/.
-clockSleep ∷ MonadBase μ IO ⇒ Clock → TimeSpec → μ TimeSpec
+clockSleep ∷ MonadBase IO μ ⇒ Clock → TimeSpec → μ TimeSpec
 clockSleep clock ts =
   liftBase $ with ts $ \pTs →
     alloca $ \pLeft → do 
@@ -251,7 +251,7 @@
 
 -- | Sleep until the clock time reaches the specified value.
 --   See /clock_nanosleep(3)/.
-clockSleepAbs ∷ MonadBase μ IO ⇒ Clock → TimeSpec → μ ()
+clockSleepAbs ∷ MonadBase IO μ ⇒ Clock → TimeSpec → μ ()
 clockSleepAbs clock ts =
   liftBase $ with ts $ \p →
     throwErrnoIfMinus1_ "clockSleepAbs" $
diff --git a/src/System/Posix/Timer.hsc b/src/System/Posix/Timer.hsc
--- a/src/System/Posix/Timer.hsc
+++ b/src/System/Posix/Timer.hsc
@@ -55,7 +55,7 @@
 newtype Timer = Timer #{itype timer_t} deriving (Eq, Ord, Show, Storable)
 
 -- | Create a timer. See /timer_create(3)/.
-createTimer ∷ MonadBase μ IO
+createTimer ∷ MonadBase IO μ
             ⇒ Clock
             → Maybe (Signal, WordPtr) -- ^ Optional signal to raise on timer
                                       --   expirations and value of
@@ -77,7 +77,7 @@
     peek pTimer
 
 -- | Setup the timer. See /timer_settime(3)/.
-configureTimer ∷ MonadBase μ IO
+configureTimer ∷ MonadBase IO μ
                ⇒ Timer
                → Bool -- ^ Whether the expiration time is absolute.
                → TimeSpec -- ^ Expiration time. Zero value disarms the timer.
@@ -94,7 +94,7 @@
 
 -- | Get the amount of time left until the next expiration and the interval
 --   between the subsequent expirations. See /timer_gettime(3)/.
-timerTimeLeft ∷ MonadBase μ IO ⇒ Timer → μ (TimeSpec, TimeSpec)
+timerTimeLeft ∷ MonadBase IO μ ⇒ Timer → μ (TimeSpec, TimeSpec)
 timerTimeLeft timer =
   liftBase $ alloca $ \p → do
     throwErrnoIfMinus1_ "timerTimeLeft" $ c_timer_gettime timer p
@@ -102,12 +102,12 @@
     return (value, interval)
 
 -- | Get the timer overrun count. See /timer_getoverrun(3)/.
-timerOverrunCnt ∷ MonadBase μ IO ⇒ Timer → μ CInt
+timerOverrunCnt ∷ MonadBase IO μ ⇒ Timer → μ CInt
 timerOverrunCnt timer =
   liftBase $ throwErrnoIfMinus1 "timerOverrunCnt" $ c_timer_getoverrun timer
 
 -- | Destroy the timer. See /timer_delete(3)/.
-destroyTimer ∷ MonadBase μ IO ⇒ Timer → μ ()
+destroyTimer ∷ MonadBase IO μ ⇒ Timer → μ ()
 destroyTimer timer =
   liftBase $ throwErrnoIfMinus1_ "deleteTimer" $ c_timer_delete timer