diff --git a/tests/pthread_test.cpp b/tests/pthread_test.cpp
index d61c1cd..1766762 100644
--- a/tests/pthread_test.cpp
+++ b/tests/pthread_test.cpp
@@ -41,6 +41,8 @@
 #include "BionicDeathTest.h"
 #include "ScopedSignalHandler.h"
 
+#include "utils.h"
+
 extern "C" pid_t gettid();
 
 TEST(pthread, pthread_key_create) {
@@ -1158,19 +1160,14 @@
 #if defined(__BIONIC__)
   // What does /proc/self/maps' [stack] line say?
   void* maps_stack_hi = NULL;
-  FILE* fp = fopen("/proc/self/maps", "r");
-  ASSERT_TRUE(fp != NULL);
-  char line[BUFSIZ];
-  while (fgets(line, sizeof(line), fp) != NULL) {
-    uintptr_t lo, hi;
-    int name_pos;
-    sscanf(line, "%" PRIxPTR "-%" PRIxPTR " %*4s %*x %*x:%*x %*d %n", &lo, &hi, &name_pos);
-    if (strcmp(line + name_pos, "[stack]\n") == 0) {
-      maps_stack_hi = reinterpret_cast<void*>(hi);
+  std::vector<map_record> maps;
+  ASSERT_TRUE(Maps::parse_maps(&maps));
+  for (auto& map : maps) {
+    if (map.pathname == "[stack]") {
+      maps_stack_hi = reinterpret_cast<void*>(map.addr_end);
       break;
     }
   }
-  fclose(fp);
 
   // The high address of the /proc/self/maps [stack] region should equal stack_base + stack_size.
   // Remember that the stack grows down (and is mapped in on demand), so the low address of the
diff --git a/tests/utils.h b/tests/utils.h
index fd012a3..53cf6b6 100644
--- a/tests/utils.h
+++ b/tests/utils.h
@@ -38,9 +38,7 @@
 class Maps {
  public:
   static bool parse_maps(std::vector<map_record>* maps) {
-    char path[64];
-    snprintf(path, sizeof(path), "/proc/self/task/%d/maps", getpid());
-    FILE* fp = fopen(path, "re");
+    FILE* fp = fopen("/proc/self/maps", "re");
     if (fp == nullptr) {
       return false;
     }
@@ -53,11 +51,11 @@
     while (fgets(line, sizeof(line), fp) != nullptr) {
       map_record record;
       uint32_t dev_major, dev_minor;
-      char pathstr[BUFSIZ];
+      int path_offset;
       char prot[5]; // sizeof("rwxp")
-      if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4s %" SCNxPTR " %x:%x %lu %s",
+      if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4s %" SCNxPTR " %x:%x %lu %n",
             &record.addr_start, &record.addr_end, prot, &record.offset,
-            &dev_major, &dev_minor, &record.inode, pathstr) == 8) {
+            &dev_major, &dev_minor, &record.inode, &path_offset) == 7) {
         record.perms = 0;
         if (prot[0] == 'r') {
           record.perms |= PROT_READ;
@@ -72,7 +70,10 @@
         // TODO: parse shared/private?
 
         record.device = makedev(dev_major, dev_minor);
-        record.pathname = pathstr;
+        record.pathname = line + path_offset;
+        if (!record.pathname.empty() && record.pathname.back() == '\n') {
+          record.pathname.pop_back();
+        }
         maps->push_back(record);
       }
     }