diff --git a/signature.go b/signature.go
index 1c5b8d69e..5b1d6cb05 100644
--- a/signature.go
+++ b/signature.go
@@ -23,7 +23,6 @@ type SignatureInner interface {
 	AssertIsSignatureInner()
 	Bytes() []byte
 	IsZero() bool
-	String() string
 	Equals(Signature) bool
 	Wrap() Signature
 }