diff --git a/libc/bionic/gwp_asan_wrappers.cpp b/libc/bionic/gwp_asan_wrappers.cpp
index 251633d..fab29ef 100644
--- a/libc/bionic/gwp_asan_wrappers.cpp
+++ b/libc/bionic/gwp_asan_wrappers.cpp
@@ -307,8 +307,10 @@
     sysprop_names[3] = persist_default_sysprop;
   }
 
+  // TODO(mitchp): Log overrides using this.
+  const char* source;
   return get_config_from_env_or_sysprops(env_var, sysprop_names, arraysize(sysprop_names),
-                                         value_out, PROP_VALUE_MAX);
+                                         value_out, PROP_VALUE_MAX, &source);
 }
 
 bool GetGwpAsanIntegerOption(unsigned long long* result,