diff --git a/Imath.changes b/Imath.changes
index 98175a8..67a6aaa 100644
--- a/Imath.changes
+++ b/Imath.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Aug 16 11:58:58 UTC 2021 - pgajdos@suse.com
+
+- do not obsolete/provide ilmbase, Imath provides just part of
+  functionality of former ilmbase
+
 -------------------------------------------------------------------
 Sat Aug 14 22:04:53 UTC 2021 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/Imath.spec b/Imath.spec
index b0c0b5a..75459a1 100644
--- a/Imath.spec
+++ b/Imath.spec
@@ -30,10 +30,6 @@ Source2:        baselibs.conf
 BuildRequires:  cmake >= 3.12
 BuildRequires:  gcc-c++
 BuildRequires:  pkgconfig
-Obsoletes:      ilmbase < %{version}
-Provides:       ilmbase = %{version}
-Obsoletes:      IlmBase < %{version}
-Provides:       IlmBase = %{version}
 
 %description
 Imath is a library for the C++ representation of 2D and 3D vectors
@@ -47,11 +43,9 @@ License:        BSD-3-Clause AND GPL-2.0-or-later
 Group:          Development/Libraries/C and C++
 Requires:       libImath%{so_suffix}-%{sonum} = %{version}
 Requires:       libstdc++-devel
-Obsoletes:      ilmbase-devel < %{version}
-Provides:       ilmbase-devel = %{version}
 
 %description devel
-Devel files for ilmbase, which is the base library for OpenEXR.
+Devel files for Imath, which is the base library for OpenEXR.
 
 %package -n libImath%{so_suffix}-%{sonum}
 Summary:        Vector/matrix library for OpenEXR