diff --git a/core/base/utils/CbmGeometryUtils.h b/core/base/utils/CbmGeometryUtils.h
index a43cd1cfd9f9ba98190119f5e52800c2c223b118..aed9e128b8adae040c1099dc673f1ed83c22a870 100644
--- a/core/base/utils/CbmGeometryUtils.h
+++ b/core/base/utils/CbmGeometryUtils.h
@@ -3,10 +3,11 @@
    Authors: Florian Uhlig [committer], Eoin Clerkin */
 
 #include "Rtypes.h"
-#include "TGeoManager.h"
 
 class TGeoMatrix;
 class TGeoVolume;
+class TGeoManager;
+class TGeoMedium;
 class FairModule;
 class TString;