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-rw-r--r--libraries/base/GHC/Conc/Windows.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/libraries/base/GHC/Conc/Windows.hs b/libraries/base/GHC/Conc/Windows.hs
index 4cbb8cadc2..6b87b06fe7 100644
--- a/libraries/base/GHC/Conc/Windows.hs
+++ b/libraries/base/GHC/Conc/Windows.hs
@@ -53,7 +53,7 @@ import GHC.Show (Show)
import GHC.Word (Word32, Word64)
import GHC.Windows
-#ifdef mingw32_HOST_OS
+#if defined(mingw32_HOST_OS)
# if defined(i386_HOST_ARCH)
# define WINDOWS_CCONV stdcall
# elif defined(x86_64_HOST_ARCH)