diff --git a/__tests__/util.test.ts b/__tests__/util.test.ts
index 7cf071d..3ba3bba 100644
--- a/__tests__/util.test.ts
+++ b/__tests__/util.test.ts
@@ -35,6 +35,59 @@ describe('maskSigUrl', () => {
   })
 })
 
+describe('maskSigUrl handles special characters in signatures', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  it('handles signatures with slashes', () => {
+    const url = 'https://example.com/?sig=abc/123'
+    maskSigUrl(url)
+    expect(setSecret).toHaveBeenCalledWith('abc/123')
+    expect(setSecret).toHaveBeenCalledWith('abc%2F123')
+  })
+
+  it('handles signatures with plus signs', () => {
+    const url = 'https://example.com/?sig=abc+123'
+    maskSigUrl(url)
+    expect(setSecret).toHaveBeenCalledWith('abc 123')
+    expect(setSecret).toHaveBeenCalledWith('abc%20123')
+  })
+
+  it('handles signatures with equals signs', () => {
+    const url = 'https://example.com/?sig=abc=123'
+    maskSigUrl(url)
+    expect(setSecret).toHaveBeenCalledWith('abc=123')
+    expect(setSecret).toHaveBeenCalledWith('abc%3D123')
+  })
+
+  it('handles already percent-encoded signatures', () => {
+    const url = 'https://example.com/?sig=abc%2F123%3D'
+    maskSigUrl(url)
+    expect(setSecret).toHaveBeenCalledWith('abc/123=')
+    expect(setSecret).toHaveBeenCalledWith('abc%2F123%3D')
+  })
+
+  it('handles complex Azure SAS signatures', () => {
+    const url =
+      'https://example.com/container/file.txt?sig=nXyQIUj%2F%2F06Cxt80pBRYiiJlYqtPYg5sz%2FvEh5iHAhw%3D&se=2023-12-31'
+    maskSigUrl(url)
+    expect(setSecret).toHaveBeenCalledWith(
+      'nXyQIUj//06Cxt80pBRYiiJlYqtPYg5sz/vEh5iHAhw='
+    )
+    expect(setSecret).toHaveBeenCalledWith(
+      'nXyQIUj%2F%2F06Cxt80pBRYiiJlYqtPYg5sz%2FvEh5iHAhw%3D'
+    )
+  })
+
+  it('handles signatures with multiple special characters', () => {
+    const url = 'https://example.com/?sig=a/b+c=d&e=f'
+    maskSigUrl(url)
+    expect(setSecret).toHaveBeenCalledWith('a/b c=d')
+    expect(setSecret).toHaveBeenCalledWith('a%2Fb%20c%3Dd')
+  })
+})
+
 describe('maskSecretUrls', () => {
   beforeEach(() => {
     jest.clearAllMocks()
diff --git a/src/internal/shared/util.ts b/src/internal/shared/util.ts
index 2e2d643..36d2ebf 100644
--- a/src/internal/shared/util.ts
+++ b/src/internal/shared/util.ts
@@ -24,6 +24,7 @@ export function maskSigUrl(url: string): void {
     const signature = parsedUrl.searchParams.get('sig')
     if (signature) {
       setSecret(signature)
+      setSecret(encodeURIComponent(signature))
     }
   } catch (error) {
     debug(