diff --git a/MozillaThunderbird.spec b/MozillaThunderbird.spec
index 5fd345a..253ec31 100644
--- a/MozillaThunderbird.spec
+++ b/MozillaThunderbird.spec
@@ -51,6 +51,7 @@ BuildRequires:  xorg-x11-libXt-devel
 BuildRequires:  xz
 BuildRequires:  yasm
 BuildRequires:  zip
+BuildRequires:  pkgconfig(libffi)
 BuildRequires:  pkgconfig(libpulse)
 %if %{with mozilla_tb_valgrind}
 BuildRequires:  pkgconfig(valgrind)