diff --git a/gomock/call.go b/gomock/call.go
index e1fe222a..9f0d98c1 100644
--- a/gomock/call.go
+++ b/gomock/call.go
@@ -498,7 +498,7 @@ func (c *Call) addAction(action func([]any) []any) {
 }
 
 func formatGottenArg(m Matcher, arg any) string {
-	got := fmt.Sprintf("%v (%T)", arg, arg)
+	got := fmt.Sprintf("%+v (%T)", arg, arg)
 	if gs, ok := m.(GotFormatter); ok {
 		got = gs.Got(arg)
 	}
diff --git a/gomock/controller_test.go b/gomock/controller_test.go
index 7e0397d7..74c415c0 100644
--- a/gomock/controller_test.go
+++ b/gomock/controller_test.go
@@ -298,13 +298,13 @@ func TestUnexpectedArgValue_FirstArg(t *testing.T) {
 		// the method argument (of TestStruct type) has 1 unexpected value (for the Message field)
 		ctrl.Call(subject, "ActOnTestStructMethod", TestStruct{Number: 123, Message: "no message"}, 15)
 	}, "Unexpected call to", "doesn't match the argument at index 0",
-		"Got: {123 no message} (gomock_test.TestStruct)\nWant: is equal to {123 hello %s} (gomock_test.TestStruct)")
+		"Got: {Number:123 Message:no message} (gomock_test.TestStruct)\nWant: is equal to {Number:123 Message:hello %s} (gomock_test.TestStruct)")
 
 	reporter.assertFatal(func() {
 		// the method argument (of TestStruct type) has 2 unexpected values (for both fields)
 		ctrl.Call(subject, "ActOnTestStructMethod", TestStruct{Number: 11, Message: "no message"}, 15)
 	}, "Unexpected call to", "doesn't match the argument at index 0",
-		"Got: {11 no message} (gomock_test.TestStruct)\nWant: is equal to {123 hello %s} (gomock_test.TestStruct)")
+		"Got: {Number:11 Message:no message} (gomock_test.TestStruct)\nWant: is equal to {Number:123 Message:hello %s} (gomock_test.TestStruct)")
 
 	reporter.assertFatal(func() {
 		// The expected call wasn't made.
diff --git a/gomock/string.go b/gomock/string.go
index ec4ca7e4..3bf16b12 100644
--- a/gomock/string.go
+++ b/gomock/string.go
@@ -15,7 +15,7 @@ func getString(x any) string {
 	if s, ok := x.(fmt.Stringer); ok {
 		return s.String()
 	}
-	return fmt.Sprintf("%v", x)
+	return fmt.Sprintf("%+v", x)
 }
 
 // isGeneratedMock checks if the given type has a "isgomock" field,