diff --git a/src/coreclr/debug/runtimeinfo/data-descriptor.c b/src/coreclr/debug/runtimeinfo/data-descriptor.c
index d5e76252f7385..4f432a1f98b55 100644
--- a/src/coreclr/debug/runtimeinfo/data-descriptor.c
+++ b/src/coreclr/debug/runtimeinfo/data-descriptor.c
@@ -93,6 +93,7 @@ struct CDacStringPoolSizes
 #undef CDAC_GLOBAL_POINTER
 #undef CDAC_GLOBAL
 #undef CDAC_GLOBALS_END
+    char cdac_string_pool_trailing_nil;
 };
 
 #define GET_TYPE_NAME(name) offsetof(struct CDacStringPoolSizes, MAKE_TYPELEN_NAME(name))