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-rw-r--r--libraries/base/GHC/Conc/Windows.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/libraries/base/GHC/Conc/Windows.hs b/libraries/base/GHC/Conc/Windows.hs
index ed5e0452a0..e7127ab5ef 100644
--- a/libraries/base/GHC/Conc/Windows.hs
+++ b/libraries/base/GHC/Conc/Windows.hs
@@ -52,6 +52,7 @@ import GHC.Real (div, fromIntegral)
import GHC.Show (Show)
import GHC.Word (Word32, Word64)
import GHC.Windows
+import GHC.Prim.Ext
#if defined(mingw32_HOST_OS)
# if defined(i386_HOST_ARCH)