diff --git a/jemalloc/include/jemalloc/internal/ckh.h b/jemalloc/include/jemalloc/internal/ckh.h
index c39ea5c7..d4e391b6 100644
--- a/jemalloc/include/jemalloc/internal/ckh.h
+++ b/jemalloc/include/jemalloc/internal/ckh.h
@@ -45,7 +45,7 @@ struct ckh_s {
 #endif
 
 	/* Used for pseudo-random number generation. */
-#define	CKH_A		12345
+#define	CKH_A		1103515241
 #define	CKH_C		12347
 	uint32_t	prn_state;
 
diff --git a/jemalloc/src/prof.c b/jemalloc/src/prof.c
index 783a83d2..e715da9a 100644
--- a/jemalloc/src/prof.c
+++ b/jemalloc/src/prof.c
@@ -644,7 +644,7 @@ prof_sample_threshold_update(void)
 	 */
 	PROF_SAMPLE_STATE_GET(prof_sample_state);
 	prn64(r, 53, prof_sample_state->prn_state,
-	    (uint64_t)1125899906842625LLU, 1058392653243283975);
+	    (uint64_t)6364136223846793005LLU, (uint64_t)1442695040888963407LLU);
 	u = (double)r * (1.0/9007199254740992.0L);
 	prof_sample_state->threshold = (uint64_t)(log(u) /
 	    log(1.0 - (1.0 / (double)((uint64_t)1U << opt_lg_prof_sample))))