diff --git a/Utils/doxygen_config b/Utils/doxygen_config
index 3803e6da40..991adfc5ba 100644
--- a/Utils/doxygen_config
+++ b/Utils/doxygen_config
@@ -23,7 +23,7 @@ MULTILINE_CPP_IS_BRIEF = NO
 DETAILS_AT_TOP         = NO
 INHERIT_DOCS           = YES
 DISTRIBUTE_GROUP_DOC   = NO
-TAB_SIZE               = 8
+TAB_SIZE               = 4
 ALIASES                = 
 OPTIMIZE_OUTPUT_FOR_C  = NO
 OPTIMIZE_OUTPUT_JAVA   = NO