diff --git a/rust.spec b/rust.spec
index 32eb2ed..c3bb4b9 100644
--- a/rust.spec
+++ b/rust.spec
@@ -68,12 +68,15 @@ BuildRequires:  fdupes
 %endif
 %if %{with bootstrap}
 BuildRequires:  cargo-bootstrap
-BuildRequires:  rustc-bootstrap <= %{version}
-BuildRequires:  rustc-bootstrap >= %{prev_version}
+BuildRequires:  rustc-bootstrap == %{prev_version}
 %else
+    %ifarch %{arm} aarch64 ppc64 ppc64le
+BuildRequires:  cargo-bootstrap
+BuildRequires:  rustc-bootstrap == %{prev_version}
+    %else
 BuildRequires:  cargo
-#BuildRequires:  rust <= %{version}
 BuildRequires:  rust == %{prev_version}
+    %endif
 %endif
 
 %description