diff --git a/fuzz-wrapfd.c b/fuzz-wrapfd.c
index 39d2b62..313a110 100644
--- a/fuzz-wrapfd.c
+++ b/fuzz-wrapfd.c
@@ -6,12 +6,12 @@
 
 #define IOWRAP_MAXFD (FD_SETSIZE-1)
 static const int MAX_RANDOM_IN = 50000;
-static const double CHANCE_CLOSE = 1.0 / 300;
-static const double CHANCE_INTR = 1.0 / 200;
-static const double CHANCE_READ1 = 0.6;
-static const double CHANCE_READ2 = 0.3;
-static const double CHANCE_WRITE1 = 0.8;
-static const double CHANCE_WRITE2 = 0.3;
+static const double CHANCE_CLOSE = 1.0 / 600;
+static const double CHANCE_INTR = 1.0 / 900;
+static const double CHANCE_READ1 = 0.96;
+static const double CHANCE_READ2 = 0.5;
+static const double CHANCE_WRITE1 = 0.96;
+static const double CHANCE_WRITE2 = 0.5;
 
 struct fdwrap {
 	enum wrapfd_mode mode;