diff --git a/gtsam/CMakeLists.txt b/gtsam/CMakeLists.txt
index d08ded7e8..ada7ae12d 100644
--- a/gtsam/CMakeLists.txt
+++ b/gtsam/CMakeLists.txt
@@ -5,7 +5,7 @@ set (gtsam_subdirs
     base
     geometry
     inference
-	  symbolic
+    symbolic
     discrete
     linear
     nonlinear
@@ -69,7 +69,7 @@ set(gtsam_srcs
     ${base_srcs}
     ${geometry_srcs}
     ${inference_srcs}
-	  ${symbolic_srcs}
+    ${symbolic_srcs}
     ${discrete_srcs}
     ${linear_srcs}
     ${nonlinear_srcs}