diff --git a/python-graph-tool.spec b/python-graph-tool.spec
index 5590a15..4dba41d 100644
--- a/python-graph-tool.spec
+++ b/python-graph-tool.spec
@@ -150,7 +150,7 @@ Requires:       python3-%{modname}%{?_isa} = %{version}-%{release}
 # Since this header-only package is re-exposed as part of the extension API,
 # dependent packages should ideally also BuildRequire pcg-cpp-static for
 # tracking, per guidelines.
-Requires:       pcg-cpp-devel%{?_isa}
+Requires:       pcg-cpp-devel
 
 Provides:       graph-tool-devel%{?_isa} = %{version}-%{release}