diff --git a/libidn.spec b/libidn.spec
index 878c006..704efcb 100644
--- a/libidn.spec
+++ b/libidn.spec
@@ -22,7 +22,7 @@ names.
 %package devel
 Summary: Development files for the libidn library
 Group: Development/Libraries
-Requires: %{name} = %{version}-%{release}
+Requires: %{name}%{?_isa} = %{version}-%{release}
 Requires: pkgconfig
 
 %description devel