diff --git a/absl/base/attributes.h b/absl/base/attributes.h
index f21dcb3..d4f67a1 100644
--- a/absl/base/attributes.h
+++ b/absl/base/attributes.h
@@ -843,15 +843,11 @@
 // See also the upstream documentation:
 // https://clang.llvm.org/docs/AttributeReference.html#trivial-abi
 //
-#if ABSL_HAVE_CPP_ATTRIBUTE(clang::trivial_abi)
-#define ABSL_ATTRIBUTE_TRIVIAL_ABI [[clang::trivial_abi]]
-#define ABSL_HAVE_ATTRIBUTE_TRIVIAL_ABI 1
-#elif ABSL_HAVE_ATTRIBUTE(trivial_abi)
-#define ABSL_ATTRIBUTE_TRIVIAL_ABI __attribute__((trivial_abi))
-#define ABSL_HAVE_ATTRIBUTE_TRIVIAL_ABI 1
-#else
+// b/321691395 - This is currently disabled in open-source builds since
+// compiler support differs. If system libraries compiled with GCC are mixed
+// with libraries compiled with Clang, types will have different ideas about
+// their ABI, leading to hard to debug crashes.
 #define ABSL_ATTRIBUTE_TRIVIAL_ABI
-#endif
 
 // ABSL_ATTRIBUTE_NO_UNIQUE_ADDRESS
 //