diff --git a/ghex.spec b/ghex.spec
index 8d2cb72..007e829 100644
--- a/ghex.spec
+++ b/ghex.spec
@@ -29,7 +29,7 @@ A useful tool for working with raw data.
 %package        devel
 Summary:        Development files for %{name}
 Group:          Development/Libraries
-Requires:       %{name} = %{version}-%{release}
+Requires:       %{name}%{?_isa} = %{version}-%{release}
 
 %description    devel
 The %{name}-devel package contains libraries and header files for
@@ -94,6 +94,7 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 - Include new symbolic icons
 - Use make_install macro
 - Mark license files with the license macro
+- Tighten -devel package deps with the _isa macro
 
 * Wed Jun 17 2015 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 3.10.1-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_23_Mass_Rebuild