diff --git a/firefox.spec b/firefox.spec
index 31f3ce1..c67afe3 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -74,6 +74,7 @@ BuildRequires:	zip
 BuildRequires:	clang
 BuildRequires:	clang-devel
 BuildRequires:	lld
+BuildRequires:	libatomic-devel
 BuildRequires:	pkgconfig(xinerama)
 BuildRequires:	pkgconfig(xscrnsaver)
 BuildRequires:	jpeg-devel