diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
@@ -1114,6 +1114,8 @@
   // This should (does) work for both PowerPC64 Endian modes.
   // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
   return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
+#elif SANITIZER_LOONGARCH64
+  return (1ULL << 47) - 1;  // 0x00007fffffffffffUL
 #elif SANITIZER_RISCV64
   return (1ULL << 38) - 1;
 # elif SANITIZER_MIPS64