diff --git a/firefox.spec b/firefox.spec
index 7dff6aa..43324de 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -110,6 +110,7 @@ BuildRequires:	python-virtualenv
 BuildRequires:	gstreamer0.10-devel
 BuildRequires:	libgstreamer0.10-plugins-base-devel
 BuildRequires:	pkgconfig(opus)
+BuildRequires:	pkgconfig(libpng16)
 BuildRequires:	bzip2-devel
 
 %if 0%{?prel}