diff --git a/reference.go b/reference.go
index ef12d0b..ac3580c 100644
--- a/reference.go
+++ b/reference.go
@@ -40,7 +40,7 @@ func (v *Reference) SetSymbolicTarget(target string, sig *Signature, msg string)
 	if err != nil {
 		return nil, err
 	}
-	defer C.free(unsafe.Pointer(csig))
+	defer C.git_signature_free(csig)
 
 	var cmsg *C.char
 	if msg == "" {
@@ -68,7 +68,7 @@ func (v *Reference) SetTarget(target *Oid, sig *Signature, msg string) (*Referen
 	if err != nil {
 		return nil, err
 	}
-	defer C.free(unsafe.Pointer(csig))
+	defer C.git_signature_free(csig)
 
 	var cmsg *C.char
 	if msg == "" {
@@ -109,7 +109,7 @@ func (v *Reference) Rename(name string, force bool, sig *Signature, msg string)
 	if err != nil {
 		return nil, err
 	}
-	defer C.free(unsafe.Pointer(csig))
+	defer C.git_signature_free(csig)
 
 	var cmsg *C.char
 	if msg == "" {
diff --git a/remote.go b/remote.go
index b9acc71..0635608 100644
--- a/remote.go
+++ b/remote.go
@@ -614,7 +614,7 @@ func (o *Remote) Fetch(refspecs []string, sig *Signature, msg string) error {
 		if err != nil {
 			return err
 		}
-		defer C.free(unsafe.Pointer(csig))
+		defer C.git_signature_free(csig)
 	}
 
 	var cmsg *C.char = nil
@@ -709,7 +709,7 @@ func (o *Remote) Push(refspecs []string, opts *PushOptions, sig *Signature, msg
 		if err != nil {
 			return err
 		}
-		defer C.free(unsafe.Pointer(csig))
+		defer C.git_signature_free(csig)
 	}
 
 	var cmsg *C.char
diff --git a/repository.go b/repository.go
index 7fac277..5c869ec 100644
--- a/repository.go
+++ b/repository.go
@@ -214,7 +214,7 @@ func (v *Repository) SetHead(refname string, sig *Signature, msg string) error {
 	if err != nil {
 		return err
 	}
-	defer C.free(unsafe.Pointer(csig))
+	defer C.git_signature_free(csig)
 
 	var cmsg *C.char
 	if msg != "" {
@@ -237,7 +237,7 @@ func (v *Repository) SetHeadDetached(id *Oid, sig *Signature, msg string) error
 	if err != nil {
 		return err
 	}
-	defer C.free(unsafe.Pointer(csig))
+	defer C.git_signature_free(csig)
 
 	var cmsg *C.char
 	if msg != "" {
@@ -263,7 +263,7 @@ func (v *Repository) CreateReference(name string, id *Oid, force bool, sig *Sign
 	if err != nil {
 		return nil, err
 	}
-	defer C.free(unsafe.Pointer(csig))
+	defer C.git_signature_free(csig)
 
 	var cmsg *C.char
 	if msg == "" {
@@ -297,7 +297,7 @@ func (v *Repository) CreateSymbolicReference(name, target string, force bool, si
 	if err != nil {
 		return nil, err
 	}
-	defer C.free(unsafe.Pointer(csig))
+	defer C.git_signature_free(csig)
 
 	var cmsg *C.char
 	if msg == "" {