diff --git a/tests/sys_prctl_test.cpp b/tests/sys_prctl_test.cpp
index b7c542b84..f0ac1c33a 100644
--- a/tests/sys_prctl_test.cpp
+++ b/tests/sys_prctl_test.cpp
@@ -41,7 +41,6 @@ TEST(sys_prctl, bug_20017123) {
   std::string file_data;
   ASSERT_TRUE(android::base::ReadFileToString("/proc/self/maps", &file_data));
 
-  uintptr_t last_start = 0;
   uintptr_t last_end = 0;
   std::vector<std::string> lines = android::base::Split(file_data, "\n");
   for (size_t i = 0; i < lines.size(); i++) {
@@ -55,7 +54,6 @@ TEST(sys_prctl, bug_20017123) {
     // This will never fail on the first line, so no need to do any special checking.
     ASSERT_GE(start, last_end)
         << "Overlapping map detected:\n" << lines[i -1] << '\n' << lines[i] << '\n';
-    last_start = start;
     last_end = end;
   }