diff --git a/geant4.spec b/geant4.spec
index 2687b7b2725..d8ff43f072b 100644
--- a/geant4.spec
+++ b/geant4.spec
@@ -2,12 +2,12 @@
 ## INCLUDE compilation_flags
 ## INCLUDE compilation_flags_lto
 %define use_vecgeom 1
-#%define tag d35b0306a837c2b3640b250c1af599688eee8df1
-#%define branch cms/v%{realversion}
-#%define github_user cms-externals
 %define tag cf4c6712c60cdf2b4d8799e34e176917c2de358d
-%define branch master
-%define github_user Geant4
+%define branch cms/v%{realversion}
+%define github_user cms-externals
+#%define tag cf4c6712c60cdf2b4d8799e34e176917c2de358d
+#%define branch master
+#%define github_user Geant4
 Source: git+https://github.com/%github_user/%{n}.git?obj=%{branch}/%{tag}&export=%{n}.%{realversion}&output=/%{n}.%{realversion}-%{tag}.tgz
 
 BuildRequires: cmake gmake