diff --git a/imath.spec b/imath.spec
index 9c7c133..365bd1c 100644
--- a/imath.spec
+++ b/imath.spec
@@ -1,5 +1,6 @@
 %global srcname Imath
 %global sover 28
+%global pyver_under %(%{python3} -Esc "import sys; sys.stdout.write('{0.major}_{0.minor}'.format(sys.version_info))")
 
 Name:           imath
 Version:        3.0.2
@@ -77,7 +78,7 @@ rm -rf html/.{doctrees,buildinfo}
 %{_libdir}/libImath-3_0.so.%{sover}*
 
 %files -n python3-%{name}
-%{_libdir}/libPyImath_Python3_9-3_0.so.%{sover}*
+%{_libdir}/libPyImath_Python%{pyver_under}-3_0.so.%{sover}*
 %{python3_sitearch}/imath.so
 %{python3_sitearch}/imathnumpy.so
 
@@ -89,7 +90,7 @@ rm -rf html/.{doctrees,buildinfo}
 %{_libdir}/cmake/Imath/
 %{_libdir}/libImath.so
 %{_libdir}/libImath-3_0.so
-%{_libdir}/libPyImath_Python3_9-3_0.so
+%{_libdir}/libPyImath_Python%{pyver_under}-3_0.so
 
 
 %changelog