diff --git a/src/Makefile.am b/src/Makefile.am
index b97aa8cea74a9d4ed0d91259f051e49790b4a121..87969e8b7f83fb374ae1a799230fdd39b95c7369 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -23,7 +23,12 @@ run-one-body-sample-gdb: one-body-sample
 	libtool --mode execute gdb ./one-body-sample
 
 one_body_sample_SOURCES = \
-	one-body-sample.cc assemblers.cc LambertW.cc compute_state.cc vtk.cc print.cc
+	LambertW.cc \
+	assemblers.cc \
+	compute_state.cc \
+	one-body-sample.cc \
+	print.cc \
+	vtk.cc
 one_body_sample_CPPFLAGS = \
 	$(AM_CPPFLAGS) -Dsrcdir=\"$(srcdir)\"
 one_body_sample_LDADD = \