diff --git a/tests/lib/libc/stdlib/t_strtod.c b/tests/lib/libc/stdlib/t_strtod.c
index dce6cee14290..76c8322444dd 100644
--- a/tests/lib/libc/stdlib/t_strtod.c
+++ b/tests/lib/libc/stdlib/t_strtod.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: t_strtod.c,v 1.21 2011/06/14 02:37:31 jruoho Exp $ */
+/*	$NetBSD: t_strtod.c,v 1.22 2011/07/04 22:33:29 mrg Exp $ */
 
 /*-
  * Copyright (c) 2011 The NetBSD Foundation, Inc.
@@ -32,7 +32,7 @@
 /* Public domain, Otto Moerbeek <otto@drijf.net>, 2006. */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_strtod.c,v 1.21 2011/06/14 02:37:31 jruoho Exp $");
+__RCSID("$NetBSD: t_strtod.c,v 1.22 2011/07/04 22:33:29 mrg Exp $");
 
 #include <errno.h>
 #include <math.h>
@@ -82,6 +82,12 @@ ATF_TC_HEAD(strtod_hex, tc)
 	atf_tc_set_md_var(tc, "descr", "A strtod(3) with hexadecimals");
 }
 
+#ifdef __vax__
+#define SMALL_NUM       1.0e-38
+#else
+#define SMALL_NUM       1.0e-40
+#endif
+
 ATF_TC_BODY(strtod_hex, tc)
 {
 	const char *str;
@@ -93,14 +99,14 @@ ATF_TC_BODY(strtod_hex, tc)
 
 	ATF_REQUIRE(end == str + 4);
 	ATF_REQUIRE(signbit(d) != 0);
-	ATF_REQUIRE(fabs(d) < 1.0e-40);
+	ATF_REQUIRE(fabs(d) < SMALL_NUM);
 
 	str = "-0x";
 	d = strtod(str, &end);	/* -0.0 */
 
 	ATF_REQUIRE(end == str + 2);
 	ATF_REQUIRE(signbit(d) != 0);
-	ATF_REQUIRE(fabs(d) < 1.0e-40);
+	ATF_REQUIRE(fabs(d) < SMALL_NUM);
 }
 
 ATF_TC(strtod_inf);
diff --git a/tests/lib/libm/t_ceil.c b/tests/lib/libm/t_ceil.c
index 6edb7e857ddc..20b5e3494db2 100644
--- a/tests/lib/libm/t_ceil.c
+++ b/tests/lib/libm/t_ceil.c
@@ -1,4 +1,4 @@
-/* $NetBSD: t_ceil.c,v 1.3 2011/03/25 10:42:38 jruoho Exp $ */
+/* $NetBSD: t_ceil.c,v 1.4 2011/07/04 22:33:29 mrg Exp $ */
 
 /*-
  * Copyright (c) 2011 The NetBSD Foundation, Inc.
@@ -29,7 +29,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ceil.c,v 1.3 2011/03/25 10:42:38 jruoho Exp $");
+__RCSID("$NetBSD: t_ceil.c,v 1.4 2011/07/04 22:33:29 mrg Exp $");
 
 #include <math.h>
 #include <limits.h>
@@ -42,6 +42,12 @@ ATF_TC_HEAD(ceil, tc)
 	atf_tc_set_md_var(tc, "descr", "A basic test of ceil(3)");
 }
 
+#ifdef __vax__
+#define SMALL_NUM	1.0e-38
+#else
+#define SMALL_NUM	1.0e-40
+#endif
+
 ATF_TC_BODY(ceil, tc)
 {
 	const int n = 10240;
@@ -53,8 +59,8 @@ ATF_TC_BODY(ceil, tc)
 		x = i + 0.999999999;
 		y = i + 0.000000001;
 
-		ATF_REQUIRE(fabs(ceil(x) - (double)(i + 1)) < 1.0e-40);
-		ATF_REQUIRE(fabs(ceil(x) - (double)(i + 1)) < 1.0e-40);
+		ATF_REQUIRE(fabs(ceil(x) - (double)(i + 1)) < SMALL_NUM);
+		ATF_REQUIRE(fabs(ceil(x) - (double)(i + 1)) < SMALL_NUM);
 	}
 }
 
diff --git a/tests/lib/libm/t_floor.c b/tests/lib/libm/t_floor.c
index 7ea154fca8cd..09e897c15e93 100644
--- a/tests/lib/libm/t_floor.c
+++ b/tests/lib/libm/t_floor.c
@@ -1,4 +1,4 @@
-/* $NetBSD: t_floor.c,v 1.4 2011/03/25 10:42:38 jruoho Exp $ */
+/* $NetBSD: t_floor.c,v 1.5 2011/07/04 22:33:29 mrg Exp $ */
 
 /*-
  * Copyright (c) 2011 The NetBSD Foundation, Inc.
@@ -29,7 +29,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_floor.c,v 1.4 2011/03/25 10:42:38 jruoho Exp $");
+__RCSID("$NetBSD: t_floor.c,v 1.5 2011/07/04 22:33:29 mrg Exp $");
 
 #include <math.h>
 #include <limits.h>
@@ -43,6 +43,12 @@ ATF_TC_HEAD(floor, tc)
 	atf_tc_set_md_var(tc, "descr", "A basic test of floor(3)");
 }
 
+#ifdef __vax__
+#define SMALL_NUM	1.0e-38
+#else
+#define SMALL_NUM	1.0e-40
+#endif
+
 ATF_TC_BODY(floor, tc)
 {
 	const int n = 10240;
@@ -60,8 +66,8 @@ ATF_TC_BODY(floor, tc)
 		x = i + 0.999999999;
 		y = i + 0.000000001;
 
-		ATF_REQUIRE(fabs(floor(x) - (double)i) < 1.0e-40);
-		ATF_REQUIRE(fabs(floor(y) - (double)i) < 1.0e-40);
+		ATF_REQUIRE(fabs(floor(x) - (double)i) < SMALL_NUM);
+		ATF_REQUIRE(fabs(floor(y) - (double)i) < SMALL_NUM);
 	}
 }
 
diff --git a/tests/lib/libm/t_round.c b/tests/lib/libm/t_round.c
index 12cd58a469ea..a8fd2d567f03 100644
--- a/tests/lib/libm/t_round.c
+++ b/tests/lib/libm/t_round.c
@@ -1,4 +1,4 @@
-/* $NetBSD: t_round.c,v 1.1 2011/04/08 06:49:21 jruoho Exp $ */
+/* $NetBSD: t_round.c,v 1.2 2011/07/04 22:33:29 mrg Exp $ */
 
 #include <atf-c.h>
 #include <math.h>
@@ -13,6 +13,12 @@
 #define VAL	0x0.7ffffffffffffcp0
 #define VALF	0x0.7fffff8p0
 
+#ifdef __vax__
+#define SMALL_NUM	1.0e-38
+#else
+#define SMALL_NUM	1.0e-40
+#endif
+
 ATF_TC(round_dir);
 ATF_TC_HEAD(round_dir, tc)
 {
@@ -27,14 +33,14 @@ ATF_TC_BODY(round_dir, tc)
 	b = round(a);
 	bf = roundf(af);
 
-	ATF_REQUIRE(fabs(b) < 1.0e-40);
-	ATF_REQUIRE(fabsf(bf) < 1.0e-40);
+	ATF_REQUIRE(fabs(b) < SMALL_NUM);
+	ATF_REQUIRE(fabsf(bf) < SMALL_NUM);
 
 	c = round(-a);
 	cf = roundf(-af);
 
-	ATF_REQUIRE(fabs(c) < 1.0e-40);
-	ATF_REQUIRE(fabsf(cf) < 1.0e-40);
+	ATF_REQUIRE(fabs(c) < SMALL_NUM);
+	ATF_REQUIRE(fabsf(cf) < SMALL_NUM);
 }
 
 ATF_TP_ADD_TCS(tp)