diff --git a/VoldNativeService.cpp b/VoldNativeService.cpp
index c3ad2dc..8445cd8 100644
--- a/VoldNativeService.cpp
+++ b/VoldNativeService.cpp
@@ -193,8 +193,8 @@
     // sandboxId will be in either the format shared:<shared-user-id> or <package-name>
     // and <shared-user-id> name has same requirements as <package-name>.
     std::size_t nameStartIndex = 0;
-    if (sandboxId.find("shared:") == 0) {
-        nameStartIndex = 7; // len("shared:")
+    if (android::base::StartsWith(sandboxId, "shared:")) {
+        nameStartIndex = 7;  // len("shared:")
     }
     return checkArgumentPackageName(sandboxId.substr(nameStartIndex));
 }