diff --git a/src/backend/nsl/Makefile b/src/backend/nsl/Makefile
index 76538c6c7..d1c33eac6 100644
--- a/src/backend/nsl/Makefile
+++ b/src/backend/nsl/Makefile
@@ -1,30 +1,28 @@
-all: nsl_stats_test nsl_smooth_ma_test nsl_smooth_mal_test nsl_smooth_percentile_test nsl_smooth_savgol_test nsl_sf_window_test nsl_filter_test nsl_filter_test_fftw nsl_geom_linesim_test nsl_geom_linesim_morse_test nsl_int_test nsl_fit_test
+all: nsl_stats_test nsl_smooth_ma_test nsl_smooth_mal_test nsl_smooth_percentile_test nsl_smooth_savgol_test nsl_filter_test nsl_filter_test_fftw nsl_geom_linesim_test nsl_geom_linesim_morse_test nsl_int_test nsl_fit_test
 
 nsl_stats_test: nsl_stats_test.c nsl_stats.c
 	gcc -o $@ $^ -lm -lgsl -lgslcblas
 
 nsl_smooth_ma_test: nsl_smooth_ma_test.c nsl_smooth.c nsl_sf_kernel.c nsl_stats.c
 	gcc -o $@ $^ -lm -lgsl -lgslcblas
 nsl_smooth_mal_test: nsl_smooth_mal_test.c nsl_smooth.c nsl_sf_kernel.c nsl_stats.c
 	gcc -o $@ $^ -lm -lgsl -lgslcblas
 nsl_smooth_percentile_test: nsl_smooth_percentile_test.c nsl_smooth.c nsl_sf_kernel.c nsl_stats.c
 	gcc -o $@ $^ -lm -lgsl -lgslcblas
 nsl_smooth_savgol_test: nsl_smooth_savgol_test.c nsl_smooth.c nsl_sf_kernel.c nsl_stats.c
 	gcc -o $@ $^ -lm -lgsl -lgslcblas
-nsl_sf_window_test: nsl_sf_window_test.c nsl_sf_window.c
-	gcc -o $@ $^ -lm -lgsl -lgslcblas
 nsl_filter_test: nsl_filter_test.c nsl_filter.c nsl_sf_poly.c
 	gcc -o $@ $^ -lm -lgsl -lgslcblas
 nsl_filter_test_fftw: nsl_filter_test.c nsl_filter.c nsl_sf_poly.c
 	gcc -o $@ $^ -lm -DHAVE_FFTW3 -lfftw3 -lgsl -lgslcblas
 nsl_geom_linesim_test: nsl_geom_linesim_test.c nsl_geom_linesim.c nsl_geom.c nsl_sort.c nsl_stats.c
 	gcc -o $@ $^ -lm -lgsl -lgslcblas
 nsl_geom_linesim_morse_test: nsl_geom_linesim_morse_test.c nsl_geom_linesim.c nsl_geom.c nsl_sort.c nsl_stats.c
 	gcc -O2 -o $@ $^ -lm -lgsl -lgslcblas
 nsl_int_test: nsl_int_test.c nsl_int.c nsl_sf_poly.c
 	gcc -o $@ $^ -lm -lgsl -lgslcblas
 nsl_fit_test: nsl_fit_test.c nsl_fit.c nsl_sf_basic.c Faddeeva.c
 	gcc -o $@ $^ -lm -lgsl -lgslcblas
 
 clean:
-	rm -f nsl_stats_test nsl_smooth_ma_test nsl_smooth_mal_test nsl_smooth_percentile_test nsl_smooth_savgol_test nsl_dft_test nsl_dft_test_fftw nsl_sf_window_test nsl_filter_test nsl_filter_test_fftw nsl_geom_linesim_test nsl_geom_linesim_morse_test nsl_diff_test nsl_int_test nsl_fit_test
+	rm -f nsl_stats_test nsl_smooth_ma_test nsl_smooth_mal_test nsl_smooth_percentile_test nsl_smooth_savgol_test nsl_dft_test nsl_dft_test_fftw nsl_filter_test nsl_filter_test_fftw nsl_geom_linesim_test nsl_geom_linesim_morse_test nsl_diff_test nsl_int_test nsl_fit_test
diff --git a/src/backend/nsl/nsl_sf_window_test.c b/src/backend/nsl/nsl_sf_window_test.c
deleted file mode 100644
index 364d8dc00..000000000
--- a/src/backend/nsl/nsl_sf_window_test.c
+++ /dev/null
@@ -1,45 +0,0 @@
-/***************************************************************************
-    File                 : nsl_sf_window_test.c
-    Project              : LabPlot
-    Description          : NSL window functions test
-    --------------------------------------------------------------------
-    Copyright            : (C) 2016 by Stefan Gerlach (stefan.gerlach@uni.kn)
-
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *  This program is free software; you can redistribute it and/or modify   *
- *  it under the terms of the GNU General Public License as published by   *
- *  the Free Software Foundation; either version 2 of the License, or      *
- *  (at your option) any later version.                                    *
- *                                                                         *
- *  This program is distributed in the hope that it will be useful,        *
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
- *  GNU General Public License for more details.                           *
- *                                                                         *
- *   You should have received a copy of the GNU General Public License     *
- *   along with this program; if not, write to the Free Software           *
- *   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
- *   Boston, MA  02110-1301  USA                                           *
- *                                                                         *
- ***************************************************************************/
-
-#include <stdio.h>
-#include "nsl_sf_window.h"
-
-int main() {
-	const int N = 10;
-	double data[] = {1,1,1,1,1,1,1,1,1,1};
-
-	int i;
-	nsl_sf_window_type t;
-
-	for (t = nsl_sf_window_uniform; t <= nsl_sf_window_lanczos; t++) {
-		nsl_sf_apply_window(data, N, t);
-		for(i = 0; i < N; i++)
-			printf("%.15g ", data[i]);
-		puts("\n");
-	}
-}