diff --git a/GNUmakefile b/GNUmakefile
index e997031f8f52dc548d629684b58a7d9b6d31498f..e79b993b037ec701fde2b5c25a1ec332533141bd 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -3,7 +3,7 @@
 # 1. Source files and libraries
 
 makefile_dir = .
-VPATH = ${makefile_dir}/Sources ${makefile_dir}/Tests
+VPATH = ${makefile_dir} ${makefile_dir}/Tests
 
 src_test_local_extrema = test_local_extrema.f local_extrema.f
 
diff --git a/Sources/derived_types.f b/derived_types.f
similarity index 100%
rename from Sources/derived_types.f
rename to derived_types.f
diff --git a/Sources/dispatch_snapshot.f b/dispatch_snapshot.f
similarity index 100%
rename from Sources/dispatch_snapshot.f
rename to dispatch_snapshot.f
diff --git a/Sources/get_1_outerm.f b/get_1_outerm.f
similarity index 100%
rename from Sources/get_1_outerm.f
rename to get_1_outerm.f
diff --git a/Sources/get_snapshot.f b/get_snapshot.f
similarity index 100%
rename from Sources/get_snapshot.f
rename to get_snapshot.f
diff --git a/Sources/good_contour.f b/good_contour.f
similarity index 100%
rename from Sources/good_contour.f
rename to good_contour.f
diff --git a/Sources/inside_4.f b/inside_4.f
similarity index 100%
rename from Sources/inside_4.f
rename to inside_4.f
diff --git a/Sources/local_extrema.f b/local_extrema.f
similarity index 100%
rename from Sources/local_extrema.f
rename to local_extrema.f
diff --git a/Sources/max_speed_contour_ssh.f b/max_speed_contour_ssh.f
similarity index 100%
rename from Sources/max_speed_contour_ssh.f
rename to max_speed_contour_ssh.f
diff --git a/Sources/mean_speed.f b/mean_speed.f
similarity index 100%
rename from Sources/mean_speed.f
rename to mean_speed.f
diff --git a/Sources/outermost_possible_level.f b/outermost_possible_level.f
similarity index 100%
rename from Sources/outermost_possible_level.f
rename to outermost_possible_level.f
diff --git a/Sources/receive_snapshot.f b/receive_snapshot.f
similarity index 100%
rename from Sources/receive_snapshot.f
rename to receive_snapshot.f
diff --git a/Sources/send_snapshot.f b/send_snapshot.f
similarity index 100%
rename from Sources/send_snapshot.f
rename to send_snapshot.f
diff --git a/Sources/set_all_outerm.f b/set_all_outerm.f
similarity index 100%
rename from Sources/set_all_outerm.f
rename to set_all_outerm.f
diff --git a/Sources/set_max_speed.f b/set_max_speed.f
similarity index 100%
rename from Sources/set_max_speed.f
rename to set_max_speed.f
diff --git a/Sources/spherical_polygon_area.f b/spherical_polygon_area.f
similarity index 100%
rename from Sources/spherical_polygon_area.f
rename to spherical_polygon_area.f
diff --git a/Sources/write_eddy.f b/write_eddy.f
similarity index 100%
rename from Sources/write_eddy.f
rename to write_eddy.f