--- ./sdk/runtime/vm/os_android.cc
+++ ./sdk/runtime/vm/os_android.cc
@@ -53,7 +53,7 @@ class PerfCodeObserver : public CodeObserver {
       return;
     }
     intptr_t pid = getpid();
-    char* filename = OS::SCreate(nullptr, "/tmp/perf-%" Pd ".map", pid);
+    char* filename = OS::SCreate(nullptr, "@TERMUX_PREFIX@/tmp/perf-%" Pd ".map", pid);
     out_file_ = (*file_open)(filename, true);
     free(filename);
   }