diff --git a/jwk/cast_test.go b/jwk/cast_test.go
index 8ab4051a62..f5798fed98 100644
--- a/jwk/cast_test.go
+++ b/jwk/cast_test.go
@@ -7,6 +7,10 @@ import (
 )
 
 func TestMustRSAPrivate(t *testing.T) {
+	if testing.Short() {
+		t.SkipNow()
+	}
+
 	keys, err := new(RS256Generator).Generate("")
 	assert.Nil(t, err)
 
diff --git a/jwk/generator_test.go b/jwk/generator_test.go
index 0ceed1b647..a155bac272 100644
--- a/jwk/generator_test.go
+++ b/jwk/generator_test.go
@@ -11,6 +11,10 @@ import (
 )
 
 func TestGenerator(t *testing.T) {
+	if testing.Short() {
+		t.SkipNow()
+	}
+
 	for k, c := range []struct {
 		g     KeyGenerator
 		check func(*jose.JsonWebKeySet)
diff --git a/rand/numeric/int_test.go b/rand/numeric/int_test.go
index b2667acee1..be889ab011 100644
--- a/rand/numeric/int_test.go
+++ b/rand/numeric/int_test.go
@@ -27,6 +27,10 @@ func TestUInt32(t *testing.T) {
 }
 
 func TestInt64IsUnique(t *testing.T) {
+	if testing.Short() {
+		t.SkipNow()
+	}
+
 	// Probability of collision is around 1 in a million
 	times := 6000000
 	s := make(map[int64]bool)
@@ -43,6 +47,10 @@ func TestInt64IsUnique(t *testing.T) {
 }
 
 func TestUInt64IsUnique(t *testing.T) {
+	if testing.Short() {
+		t.SkipNow()
+	}
+
 	// Probability of collision is around 1 in a million
 	times := 6000000
 	s := make(map[uint64]bool)
@@ -59,6 +67,10 @@ func TestUInt64IsUnique(t *testing.T) {
 }
 
 func TestInt32IsUnique(t *testing.T) {
+	if testing.Short() {
+		t.SkipNow()
+	}
+
 	// Probability of collision is around 1 in 1000
 	times := 3000
 	s := make(map[int32]bool)
@@ -75,6 +87,10 @@ func TestInt32IsUnique(t *testing.T) {
 }
 
 func TestUInt32IsUnique(t *testing.T) {
+	if testing.Short() {
+		t.SkipNow()
+	}
+
 	// Probability of collision is around 1 in 1000
 	times := 3000
 	s := make(map[uint32]bool)
diff --git a/rand/sequence/sequence_test.go b/rand/sequence/sequence_test.go
index d85d1e3fda..dbeb0099d5 100644
--- a/rand/sequence/sequence_test.go
+++ b/rand/sequence/sequence_test.go
@@ -51,6 +51,10 @@ func TestRuneSequenceMatchesPattern(t *testing.T) {
 }
 
 func TestRuneSequenceIsPseudoUnique(t *testing.T) {
+	if testing.Short() {
+		t.SkipNow()
+	}
+
 	// 1 in 100 probability of collision
 	times := 9000
 	runes := []rune("ab")