diff --git a/python-PyCBC.spec b/python-PyCBC.spec
index 0589843..ab9c24b 100644
--- a/python-PyCBC.spec
+++ b/python-PyCBC.spec
@@ -91,7 +91,7 @@ of detected sources.
 %package -n %{modname}-utils
 Summary:        PyCBC utilities to analyze gravitational-wave data
 Requires:       python3-PyCBC = %{version}
-Obsoletes:      python-%{modname} <= 1.18.0
+Obsoletes:      python3-%{modname} <= 1.18.0
 
 %description -n %{modname}-utils
 PyCBC is a software package used to explore astrophysical sources of