diff --git a/sandboxed_api/sandbox2/policybuilder.cc b/sandboxed_api/sandbox2/policybuilder.cc
index c523ee0..6bcf14c 100644
--- a/sandboxed_api/sandbox2/policybuilder.cc
+++ b/sandboxed_api/sandbox2/policybuilder.cc
@@ -193,6 +193,11 @@ PolicyBuilder& PolicyBuilder::AllowSystemMalloc() {
 
 PolicyBuilder& PolicyBuilder::AllowLlvmSanitizers() {
   if constexpr (sapi::sanitizers::IsAny()) {
+    // *san use a custom allocator that runs mmap under the hood.  For example:
+    // https://github.com/llvm/llvm-project/blob/596d534ac3524052df210be8d3c01a33b2260a42/compiler-rt/lib/asan/asan_allocator.cpp#L980
+    // https://github.com/llvm/llvm-project/blob/62ec4ac90738a5f2d209ed28c822223e58aaaeb7/compiler-rt/lib/sanitizer_common/sanitizer_allocator_secondary.h#L98
+    AllowMmap();
+
     AddPolicyOnSyscall(__NR_madvise, {
                                          ARG_32(2),
                                          JEQ32(MADV_DONTDUMP, ALLOW),
@@ -204,13 +209,8 @@ PolicyBuilder& PolicyBuilder::AllowLlvmSanitizers() {
   }
   if constexpr (sapi::sanitizers::IsASan()) {
     AllowSyscall(__NR_sigaltstack);
-    // asan uses a custom allocator that runs mmap under the hood.  For example:
-    // https://github.com/llvm/llvm-project/blob/596d534ac3524052df210be8d3c01a33b2260a42/compiler-rt/lib/asan/asan_allocator.cpp#L980
-    // https://github.com/llvm/llvm-project/blob/62ec4ac90738a5f2d209ed28c822223e58aaaeb7/compiler-rt/lib/sanitizer_common/sanitizer_allocator_secondary.h#L98
-    AllowMmap();
   }
   if constexpr (sapi::sanitizers::IsTSan()) {
-    AllowMmap();
     AllowSyscall(__NR_munmap);
     AddPolicyOnSyscall(__NR_mprotect,
                        {