diff --git a/Imath.spec b/Imath.spec
index af47a32..aed9f1e 100644
--- a/Imath.spec
+++ b/Imath.spec
@@ -45,7 +45,7 @@ Requires:       libImath%{so_suffix}-%{sonum} = %{version}
 Requires:       libstdc++-devel
 # provides ilmbase-devel partly only; openexr-devel requires Imath-devel
 # and provides/obsoletes it
-Obsoletes:      ilbase-devel < 3.0
+Obsoletes:      ilmbase-devel < 3.0
 
 %description devel
 Devel files for Imath, which is the base library for OpenEXR.