diff --git a/cmake/modules/RootConfiguration.cmake b/cmake/modules/RootConfiguration.cmake
index a2cd398fdafc33f06a6fb40108b7347b8fd97513..57d8c01319392e8aa7052d273a46cfda3dcf9349 100644
--- a/cmake/modules/RootConfiguration.cmake
+++ b/cmake/modules/RootConfiguration.cmake
@@ -381,7 +381,7 @@ set(configargs ${ROOT_CONFIGARGS})
 set(configoptions ${ROOT_CONFIGARGS})
 get_filename_component(altcc ${CMAKE_C_COMPILER} NAME)
 get_filename_component(altcxx ${CMAKE_CXX_COMPILER} NAME)
-get_filename_component(altf77 ${CMAKE_Fortran_COMPILER} NAME)
+get_filename_component(altf77 "${CMAKE_Fortran_COMPILER}" NAME)
 get_filename_component(altld ${CMAKE_CXX_COMPILER} NAME)
 
 set(pythonvers ${PYTHON_VERSION})