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-rw-r--r--src/prng/rand_r.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/src/prng/rand_r.c b/src/prng/rand_r.c
index ef26dbde..638614c8 100644
--- a/src/prng/rand_r.c
+++ b/src/prng/rand_r.c
@@ -1,6 +1,15 @@
 #include <stdlib.h>
 
+static unsigned temper(unsigned x)
+{
+	x ^= x>>11;
+	x ^= x<<7 & 0x9D2C5680;
+	x ^= x<<15 & 0xEFC60000;
+	x ^= x>>18;
+	return x;
+}
+
 int rand_r(unsigned *seed)
 {
-	return (*seed = *seed * 1103515245 + 12345)/2;
+	return temper(*seed = *seed * 1103515245 + 12345)/2;
 }