diff --git a/doc/Doxyfile b/doc/Doxyfile
index 6e4632967..c2b09347e 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -822,7 +822,7 @@ INPUT                  += \
                          nvme-cli.md \
                          nvmf.md \
                          nvmf_tgt_pg.md \
-			 nvmf_tracing.md \
+                         nvmf_tracing.md \
                          peer_2_peer.md \
                          porting.md \
                          spdkcli.md \