diff --git a/firefox.spec b/firefox.spec
index f9ba42b..77f005c 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -206,6 +206,7 @@ BuildRequires:  xorg-x11-server-Xvfb
 %endif
 %if %{?build_with_rust}
 BuildRequires:  rust
+BuildRequires:  cargo
 %endif
 
 Obsoletes:      mozilla <= 37:1.7.13