diff --git a/build/automationutils.py b/build/automationutils.py
index 1dfd7a470fd..abd3da8a0db 100644
--- a/build/automationutils.py
+++ b/build/automationutils.py
@@ -449,6 +449,12 @@ def environment(xrePath, env=None, crashreporter=True):
   asan = bool(mozinfo.info.get("asan"))
   if asan and (mozinfo.isLinux or mozinfo.isMac):
     try:
+      # Symbolizer support
+      llvmsym = os.path.join(xrePath, "llvm-symbolizer")
+      if os.path.isfile(llvmsym):
+        env["ASAN_SYMBOLIZER_PATH"] = llvmsym
+        log.info("ASan using symbolizer at %s", llvmsym)
+
       totalMemory = systemMemory()
 
       # Only 2 GB RAM or less available? Use custom ASan options to reduce