diff --git a/cconv.c b/cconv.c
index 3f41ae4..0d30f07 100644
--- a/cconv.c
+++ b/cconv.c
@@ -119,7 +119,7 @@
 	o->do_disk_util = le32_to_cpu(top->do_disk_util);
 	o->override_sync = le32_to_cpu(top->override_sync);
 	o->rand_repeatable = le32_to_cpu(top->rand_repeatable);
-	o->rand_seed = le32_to_cpu(top->rand_seed);
+	o->rand_seed = le64_to_cpu(top->rand_seed);
 	o->use_os_rand = le32_to_cpu(top->use_os_rand);
 	o->log_avg_msec = le32_to_cpu(top->log_avg_msec);
 	o->norandommap = le32_to_cpu(top->norandommap);
@@ -285,7 +285,7 @@
 	top->do_disk_util = cpu_to_le32(o->do_disk_util);
 	top->override_sync = cpu_to_le32(o->override_sync);
 	top->rand_repeatable = cpu_to_le32(o->rand_repeatable);
-	top->rand_seed = cpu_to_le32(o->rand_seed);
+	top->rand_seed = __cpu_to_le64(o->rand_seed);
 	top->use_os_rand = cpu_to_le32(o->use_os_rand);
 	top->log_avg_msec = cpu_to_le32(o->log_avg_msec);
 	top->norandommap = cpu_to_le32(o->norandommap);
diff --git a/ioengine.h b/ioengine.h
index 949af91..0756bc7 100644
--- a/ioengine.h
+++ b/ioengine.h
@@ -56,7 +56,7 @@
 	/*
 	 * Initial seed for generating the buffer contents
 	 */
-	unsigned long rand_seed;
+	uint64_t rand_seed;
 
 	/*
 	 * IO engine state, may be different from above when we get
diff --git a/options.c b/options.c
index 525d318..8287011 100644
--- a/options.c
+++ b/options.c
@@ -1656,7 +1656,7 @@
 	{
 		.name	= "randseed",
 		.lname	= "The random generator seed",
-		.type	= FIO_OPT_INT,
+		.type	= FIO_OPT_STR_VAL,
 		.off1	= td_var_offset(rand_seed),
 		.help	= "Set the random generator seed value",
 		.parent = "rw",
diff --git a/thread_options.h b/thread_options.h
index 2f807cd..79c3a89 100644
--- a/thread_options.h
+++ b/thread_options.h
@@ -100,7 +100,7 @@
 	unsigned int do_disk_util;
 	unsigned int override_sync;
 	unsigned int rand_repeatable;
-	unsigned int rand_seed;
+	unsigned long long rand_seed;
 	unsigned int use_os_rand;
 	unsigned int log_avg_msec;
 	unsigned int norandommap;
@@ -324,7 +324,7 @@
 	uint32_t do_disk_util;
 	uint32_t override_sync;
 	uint32_t rand_repeatable;
-	uint32_t rand_seed;
+	uint64_t rand_seed;
 	uint32_t use_os_rand;
 	uint32_t log_avg_msec;
 	uint32_t norandommap;