diff --git a/pkg/crypto/rfc6979/example_test.go b/pkg/crypto/rfc6979/example_test.go
index 29693c272..b756ea80e 100755
--- a/pkg/crypto/rfc6979/example_test.go
+++ b/pkg/crypto/rfc6979/example_test.go
@@ -26,7 +26,7 @@ func ExampleSignECDSA() {
 
 	// Hash a message.
 	alg := sha512.New()
-	alg.Write([]byte("I am a potato."))
+	_, _ = alg.Write([]byte("I am a potato."))
 	hash := alg.Sum(nil)
 
 	// Sign the message. You don't need a PRNG for this.
@@ -59,7 +59,7 @@ func ExampleSignDSA() {
 
 	// Hash a message.
 	alg := sha1.New()
-	alg.Write([]byte("I am a potato."))
+	_, _ = alg.Write([]byte("I am a potato."))
 	hash := alg.Sum(nil)
 
 	// Sign the message. You don't need a PRNG for this.
diff --git a/pkg/vm/vmopscrypto.go b/pkg/vm/vmopscrypto.go
index e38ab7402..5560c1d80 100644
--- a/pkg/vm/vmopscrypto.go
+++ b/pkg/vm/vmopscrypto.go
@@ -21,7 +21,7 @@ func SHA1(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rs
 	}
 
 	alg := sha1.New()
-	alg.Write(ba.Value())
+	_, _ = alg.Write(ba.Value())
 	hash := alg.Sum(nil)
 	res := stack.NewByteArray(hash)