diff --git a/config.mak.uname b/config.mak.uname
index ce0390db55..257b1ad2a1 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -160,6 +160,10 @@ ifeq ($(uname_O),Cygwin)
 		NO_IPV6 = YesPlease
 		OLD_ICONV = UnfortunatelyYes
 		NO_THREAD_SAFE_PREAD = YesPlease
+		# There are conflicting reports about this.
+		# On some boxes NO_MMAP is needed, and not so elsewhere.
+		# Try commenting this out if you suspect MMAP is more efficient
+		NO_MMAP = YesPlease
 	else
 		NO_REGEX = UnfortunatelyYes
 	endif
@@ -167,10 +171,6 @@ ifeq ($(uname_O),Cygwin)
 	NO_FAST_WORKING_DIRECTORY = UnfortunatelyYes
 	NO_TRUSTABLE_FILEMODE = UnfortunatelyYes
 	NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
-	# There are conflicting reports about this.
-	# On some boxes NO_MMAP is needed, and not so elsewhere.
-	# Try commenting this out if you suspect MMAP is more efficient
-	NO_MMAP = YesPlease
 	X = .exe
 	COMPAT_OBJS += compat/cygwin.o
 	UNRELIABLE_FSTAT = UnfortunatelyYes