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diff --git mfbt/Atomics.h mfbt/Atomics.h
index 495a9d3..c7f7601 100644
--- mfbt/Atomics.h
+++ mfbt/Atomics.h
@@ -34,10 +34,12 @@
* loose typing of the atomic builtins. GCC 4.5 and 4.6 lacks inline
* definitions for unspecialized std::atomic and causes linking errors.
* Therefore, we require at least 4.7.0 for using libstdc++.
+ *
+ * libc++ <atomic> is only functional with clang.
*/
# if MOZ_USING_LIBSTDCXX && MOZ_LIBSTDCXX_VERSION_AT_LEAST(4, 7, 0)
# define MOZ_HAVE_CXX11_ATOMICS
-# elif MOZ_USING_LIBCXX
+# elif MOZ_USING_LIBCXX && defined(__clang__)
# define MOZ_HAVE_CXX11_ATOMICS
# endif
/*
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