diff --git a/config.mak.uname b/config.mak.uname
index e7bd07cf6e..330741eb5a 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -254,6 +254,7 @@ ifeq ($(uname_O),Cygwin)
 	HAVE_CLOCK_GETTIME = YesPlease
 	HAVE_CLOCK_MONOTONIC = YesPlease
 	HAVE_SYSINFO = YesPlease
+	CSPRNG_METHOD = arc4random
 	HAVE_ALLOCA_H = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	NO_FAST_WORKING_DIRECTORY = UnfortunatelyYes