diff --git a/Makefile.am b/Makefile.am
index 7f9cc68..0c8f312 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -354,8 +354,8 @@ sgpemv2_SOURCES = \
 	src/schedulable_state_widget.cc \
 	src/schedulables_statistics_widget.cc \
 	src/schedulables_tree_widget.cc \
-  src/simulation_controller.cc \
-  src/simulation_statistics_widget.cc \
+	src/simulation_controller.cc \
+	src/simulation_statistics_widget.cc \
 	src/simulation_widget.cc \
 	src/statistics_container_window.cc \
 	src/text_simulation.cc
@@ -378,8 +378,8 @@ noinst_HEADERS += \
 	src/schedulables_statistics_widget.hh \
 	src/schedulables_tree_widget.hh \
 	src/schedulables_statistics_widget.hh \
-  src/simulation_controller.hh \
-  src/simulation_statistics_widget.hh \
+	src/simulation_controller.hh \
+	src/simulation_statistics_widget.hh \
 	src/simulation_widget.hh \
 	src/statistics_container_window.hh \
 	src/text_simulation.hh