diff --git a/cmdline/speed.c b/cmdline/speed.c
index b18c2b7a..693ca716 100644
--- a/cmdline/speed.c
+++ b/cmdline/speed.c
@@ -1265,6 +1265,8 @@ void speed_rec(int nd, void** v, int size, int delta, int period)
 
 #ifdef CONFIG_NEON
 	SPEED_START {
+		/* raid_rec1of1() internally calls raid_gen() */
+		raid_gen_force(1, raid_gen1_neon);
 		raid_rec1_neon(1, id, ip, nd, size, v);
 	} SPEED_STOP
 
diff --git a/raid/neon.c b/raid/neon.c
index cd12e47f..1f58ed0d 100644
--- a/raid/neon.c
+++ b/raid/neon.c
@@ -1377,10 +1377,14 @@ void raid_gen6_neon_aes(int nd, size_t size, void **vv)
 void raid_rec1_neon(int nr, int *id, int *ip, int nd, size_t size, void **vv)
 {
 	BUG_ON(nr != 1);
-	if (ip[0] == 0)
-		raid_recX_neon_12(1, 1, id, ip, nd, size, vv);
-	else
-		raid_recX_neon_12(1, 0, id, ip, nd, size, vv);
+
+	/* if recovering with P uses the delta function */
+	if (ip[0] == 0) {
+		raid_rec1of1(id, nd, size, vv);
+		return;
+	}
+
+	raid_recX_neon_12(1, 0, id, ip, nd, size, vv);
 }
 
 void raid_rec2_neon(int nr, int *id, int *ip, int nd, size_t size, void **vv)
diff --git a/raid/test/speedtest.c b/raid/test/speedtest.c
index 0a829e3f..f4ba4cee 100644
--- a/raid/test/speedtest.c
+++ b/raid/test/speedtest.c
@@ -1160,6 +1160,8 @@ void speed_rec(int nd, void **v, int size, int delta, int period)
 
 #ifdef CONFIG_NEON
 	SPEED_START {
+		/* raid_rec1of1() internally calls raid_gen() */
+		raid_gen_force(1, raid_gen1_neon);
 		raid_rec1_neon(1, id, ip, nd, size, v);
 	} SPEED_STOP