diff --git a/pangomm.spec b/pangomm.spec
index 48c6f0e..72271b3 100644
--- a/pangomm.spec
+++ b/pangomm.spec
@@ -35,7 +35,7 @@ quickly create complex user interfaces.
 %package devel
 Summary:        Headers for developing programs that will use %{name}
 Group:          Development/Libraries
-Requires:       %{name} = %{version}-%{release}
+Requires:       %{name}%{?_isa} = %{version}-%{release}
 
 %description devel
 This package contains the libraries and header files needed for
@@ -99,6 +99,7 @@ find $RPM_BUILD_ROOT -type f -name "*.la" -exec rm -f {} ';'
 - Update to 2.38.1
 - Use make_install macro
 - Set minimum versions for required libraries
+- Tighten -devel deps with the _isa macro
 
 * Tue Sep 15 2015 Richard Hughes <rhughes@redhat.com> - 2.37.2-1
 - Update to 2.37.2