diff --git a/pkg/fanal/secret/builtin-rules.go b/pkg/fanal/secret/builtin-rules.go
index ae08f494ad7f..6d0c0eacfdcd 100644
--- a/pkg/fanal/secret/builtin-rules.go
+++ b/pkg/fanal/secret/builtin-rules.go
@@ -173,7 +173,7 @@ var builtinRules = []Rule{
 		Category:        CategoryAsymmetricPrivateKey,
 		Title:           "Asymmetric Private Key",
 		Severity:        "HIGH",
-		Regex:           MustCompile(`(?i)-----\s*?BEGIN[ A-Z0-9_-]*?PRIVATE KEY( BLOCK)?\s*?-----[\s]*?(?P<secret>[\sA-Za-z0-9=+/\\\r\n]+)[\s]*?-----\s*?END[ A-Z0-9_-]*? PRIVATE KEY( BLOCK)?\s*?-----`),
+		Regex:           MustCompile(`(?i)-----\s*?BEGIN[ A-Z0-9_-]*?PRIVATE KEY( BLOCK)?\s*?-----[\s]*?(?P<secret>[A-Za-z0-9=+/\\\r\n][A-Za-z0-9=+/\\\s]+)[\s]*?-----\s*?END[ A-Z0-9_-]*? PRIVATE KEY( BLOCK)?\s*?-----`),
 		SecretGroupName: "secret",
 		Keywords:        []string{"-----"},
 	},
diff --git a/pkg/fanal/secret/scanner_test.go b/pkg/fanal/secret/scanner_test.go
index d152591cb2ca..04f1f08fc1b2 100644
--- a/pkg/fanal/secret/scanner_test.go
+++ b/pkg/fanal/secret/scanner_test.go
@@ -510,6 +510,14 @@ func TestSecretScanner(t *testing.T) {
 					FirstCause:  true,
 					LastCause:   true,
 				},
+				{
+					Number:      2,
+					Content:     "",
+					Highlighted: "",
+					IsCause:     false,
+					FirstCause:  false,
+					LastCause:   false,
+				},
 			},
 		},
 	}
diff --git a/pkg/fanal/secret/testdata/asymmetric-private-key.txt b/pkg/fanal/secret/testdata/asymmetric-private-key.txt
index 926230bd92f0..68e459e1a8c7 100644
--- a/pkg/fanal/secret/testdata/asymmetric-private-key.txt
+++ b/pkg/fanal/secret/testdata/asymmetric-private-key.txt
@@ -1,4 +1,6 @@
 -----BEGIN RSA PRIVATE KEY-----
 MIIEowIBAAKCAQEAu/Nua0/1y08gkbnBfKd6VDHia8Na0ATgMQqZ4YEbi/t73g84IEPQPkLbPF3X De++JA1QzqTZbbePLsW44DbbgMX/5jj+Sh2SvGe5IXNeNwyyMox+DKQccJUPxbCxnhF/gSnF76cM BXJC63nDnGawz4g3qwU1+0sfyKG0ixFI3e3992fk6QnF49Cv5iqwjgKPIZjgfoM70r71XDKJjVTC rJdSBfyQwX2TU0CncglvJSzhhcuTeQZWldbk/BHjxINrqQIxKaG2OfBgkupPjnrImzSAUE9a/gIS REUVSamc69qqQnXER3Jmoy8HXiAQdPI+CpVVkI7FCCq4qD7fVqsNhwIDAQABAoIBAQC5707zNr1Q jk0IHR3+9agdFuSJ+08hr1Ei8vvcjN71kqqtuZyqvquKjJVamPMhRGV0QQAKDidTVV5+xPfqSBrK wBYyaXuXUr5RSMNrBjjUeOjo/PfOBaRk8/IQfoaYe3MKEotQVI+d67WsQl9zoFuWU4nO1G7c1Sry TpbPZSAS+6J7fUClUgT9pvg+EpoboXs+voeWTh9r9eracxUmlclVAdS3tP7xMv5R29EBYtjGKbF6 r0Ku/hXJjPu5Eck4/BeciEinVWn/yqSsqd5XKOUwTuLlUyAGWhJKcn/zWgaBYUvknzSmwePvW/W8 iwrEhP4GNHBEHisJHdWPtbCDdOVxAoGBAPqyR/9ocwZ3GhHz3dI53Z6UjKUPtRnxJb19ZS8UVN57 P7yCXpH+L6KhIxo9yx0D5Z4bdNSYTyjl6eFnv0FZA3UXsM2tyY+Ylih1LOqcttehJkK2JaFmuefx d6bcpPJG00EKFDZoTH5bbnrB3uGKUVJ5TMFlUbOgkATJL652VTNTAoGBAL/tVWwlO5ET80BSheJ/ V88rSF4AxK48ZNt5EG7RHph46KukwywPUnWRoFLxRtVP/udZf9Qq164IPGgDrn4E6VTpZwmp7HDv 6P8sSLwJj/YW3y9c57lA4SMoowO2ik09fbBJVvWLeev4n6taDNwgCZ4fuLUtMf/mUU3r80okeUp9 AoGAIySIyTn4HejmQ6v+5XBtK8TBLoZUKc3PL4/7di0QdJusZJ2V6jtKrC6QgCY3adrY/l/08bRk LGSGc62aduume2yVwU9iWPnX2tYKNN1BGFsjxOhJwCVpXCVSU5bMnJXnGU/zY2kdh/0DMLwqpU1B dyE/7EBqwpZ4eeNGBtvZt7cCgYB8jaZJJ6SPkzXiwWtXwTKYJMuzDaaWOGVvtRKACEBlzNmaQrPS jSMDX31/Nku0tVSEiSWW6DLOI1QoYHNGHyPZ0hrnP5pM9LTtnKybM0109ATlNNLA+6Tf70hTaYw5 cjV2STIg6eI2zEO6rRb5Z+U18/onwevX2X1cJ0rdC+yW9QKBgH0xSLUGFZwFDCPE+jKGgqJQme5Q 8oxHs1CTkV4SxeLFNldA9c6uESMppSUwO7wx+NaFAJw9m2Q9Ifmo57pncAx2iVXOA9Jxaa7YFIsL
 vKftqLPCPbAPPxkaqQi0Ico/1fzD10znRy66aosPBrbleduiynubgk+GVm9y/R6bDYhR
------END RSA PRIVATE KEY-----
\ No newline at end of file
+-----END RSA PRIVATE KEY-----
+
+-----BEGIN RSA PRIVATE KEY----- -----END RSA PRIVATE KEY-----
\ No newline at end of file