diff --git a/openmsx.spec b/openmsx.spec
index 212412e..f40f74c 100644
--- a/openmsx.spec
+++ b/openmsx.spec
@@ -61,6 +61,7 @@ EOF
 cp build/flavour-rpm.mk %{name}-catapult-%{version}/build
 
 cat > build/custom.mk << EOF
+PYTHON:=python2
 INSTALL_BASE:=%{_prefix}
 VERSION_EXEC:=false
 SYMLINK_FOR_BINARY:=false
@@ -70,6 +71,7 @@ INSTALL_DOC_DIR=%{_docdir}/%{name}
 EOF
 
 cat > %{name}-catapult-%{version}/build/custom.mk << EOF
+PYTHON:=python2
 # If we set this to %%{_prefix} catapult cannot find its resources
 INSTALL_BASE:=%{_datadir}/%{name}-catapult
 SYMLINK_FOR_BINARY:=false