diff --git a/tests/benchmark1/plot.sh b/tests/benchmark1/plot.sh
index d3a2634..f986c9c 100755
--- a/tests/benchmark1/plot.sh
+++ b/tests/benchmark1/plot.sh
@@ -9,7 +9,7 @@ gnuplot -e "
 	set term png; \
 	set terminal png size 800,600; \
 	set output '${prefix}benchmark1.png'; \
-	set key spacing 1 font 'Helvetica, 18'; \
+	set key spacing 1 font 'sans, 18'; \
 	set xlabel '# number of nodes'; \
 	set ylabel 'ping arrival [%]'; \
 	set termoption lw 3; \
diff --git a/tests/connectivity1/plot.sh b/tests/connectivity1/plot.sh
index 57af4af..988e5a6 100755
--- a/tests/connectivity1/plot.sh
+++ b/tests/connectivity1/plot.sh
@@ -14,7 +14,7 @@ gnuplot -e "
 	set term png; \
 	set terminal png size 1280,960; \
 	set output '${prefix}connectivity1.png'; \
-	set key spacing 2 font 'Helvetica, 18' center right; \
+	set key spacing 2 font 'sans, 18' center right; \
 	set xlabel 'Connection range [m]'; \
 	set ylabel 'connectivity [%]'; \
 	set xtics 50; \
diff --git a/tests/convergence1/plot.sh b/tests/convergence1/plot.sh
index 04cf277..740ca38 100755
--- a/tests/convergence1/plot.sh
+++ b/tests/convergence1/plot.sh
@@ -10,7 +10,7 @@ for id in 'line' 'rtree' 'grid4'; do
 		set term png; \
 		set terminal png size 1280,960; \
 		set output '${prefix}convergence1-$id.png'; \
-		set key spacing 2 font 'Helvetica, 18'center right; \
+		set key spacing 2 font 'sans, 18'center right; \
 		set ylabel 'packets arrived [%]'; \
 		set xlabel 'wait after start [sec]'; \
 		set termoption lw 3; \
diff --git a/tests/freifunk1/plot.sh b/tests/freifunk1/plot.sh
index b4e4e02..2696aa8 100755
--- a/tests/freifunk1/plot.sh
+++ b/tests/freifunk1/plot.sh
@@ -9,7 +9,7 @@ gnuplot -e "
 	set term png; \
 	set terminal png size 1280,960; \
 	set output '${prefix}freifunk1_traffic_stats.png'; \
-	set key spacing 3 font 'Helvetica, 18'; \
+	set key spacing 3 font 'sans, 18'; \
 	set style data histogram; \
 	set style histogram cluster gap 3; \
 	set style fill solid border -1; \
@@ -32,7 +32,7 @@ gnuplot -e "
 	set term png; \
 	set terminal png size 1280,960; \
 	set output '${prefix}freifunk1_arrival_stats.png'; \
-	set key spacing 3 font 'Helvetica, 18'; \
+	set key spacing 3 font 'sans, 18'; \
 	set style data histogram; \
 	set style histogram cluster gap 3; \
 	set style fill solid border -1; \
diff --git a/tests/gateways1/plot.sh b/tests/gateways1/plot.sh
index 9780eb7..e7a57f4 100755
--- a/tests/gateways1/plot.sh
+++ b/tests/gateways1/plot.sh
@@ -10,7 +10,7 @@ for id in 'line' 'grid4' 'rtree'; do
 		set term png; \
 		set terminal png size 1280,960; \
 		set output '${prefix}gateways1-$id.png'; \
-		set key spacing 1 font 'Helvetica, 12'; \
+		set key spacing 1 font 'sans, 12'; \
 		set xlabel '# number of nodes'; \
 		set ylabel 'tx per node [KB/s]'; \
 		set y2label 'packet arrival [%]'; \
diff --git a/tests/mobility1/plot.sh b/tests/mobility1/plot.sh
index ac81f5b..fd3203d 100755
--- a/tests/mobility1/plot.sh
+++ b/tests/mobility1/plot.sh
@@ -11,7 +11,7 @@ for step_duration in 10 30; do
 			set term png; \
 			set terminal png size 1280,960; \
 			set output '${prefix}mobility1-${step_duration}-${step_distance}_arrival_progress.png'; \
-			set key spacing 2 font 'Helvetica, 18' center right; \
+			set key spacing 2 font 'sans, 18' center right; \
 			set xlabel '${step_duration}s steps [-]'; \
 			set ylabel 'packet arrival [%]'; \
 			set yrange [0:100]; \
diff --git a/tests/mobility2/plot.sh b/tests/mobility2/plot.sh
index 47eea6c..77e5e42 100755
--- a/tests/mobility2/plot.sh
+++ b/tests/mobility2/plot.sh
@@ -12,7 +12,7 @@ gnuplot -e "
 	set term png; \
 	set terminal png size 1280,960; \
 	set output '${prefix}mobility2_arrival_progress.png'; \
-	set key spacing 2 font 'Helvetica, 18' top right; \
+	set key spacing 2 font 'sans, 18' top right; \
 	set ylabel 'packet arrival [%]'; \
 	set termoption lw 3; \
 	plot \
@@ -34,7 +34,7 @@ gnuplot -e "
 	set term png; \
 	set terminal png size 1280,960; \
 	set output '${prefix}mobility2_traffic_progress.png'; \
-	set key spacing 2 font 'Helvetica, 18' top right; \
+	set key spacing 2 font 'sans, 18' top right; \
 	set ylabel 'tx traffic per node [KB/s]'; \
 	set termoption lw 3; \
 	plot \
diff --git a/tests/satellites1/plot.sh b/tests/satellites1/plot.sh
index 32f2464..6b47ae2 100755
--- a/tests/satellites1/plot.sh
+++ b/tests/satellites1/plot.sh
@@ -9,7 +9,7 @@ gnuplot -e "
 	set term png; \
 	set terminal png size 1280,960; \
 	set output '${prefix}satellites1.png'; \
-	set key spacing 2 font 'Helvetica, 18'center right; \
+	set key spacing 2 font 'sans, 18'center right; \
 	set ylabel 'packets arrived [%]'; \
 	set yrange [0:105]; \
 	set xlabel 'real_time [sec]'; \
diff --git a/tests/satellites2/plot.sh b/tests/satellites2/plot.sh
index 1b5534c..4a5d982 100755
--- a/tests/satellites2/plot.sh
+++ b/tests/satellites2/plot.sh
@@ -9,7 +9,7 @@ gnuplot -e "
 	set term png; \
 	set terminal png size 1280,960; \
 	set output '${prefix}satellites2.png'; \
-	set key spacing 2 font 'Helvetica, 18'center right; \
+	set key spacing 2 font 'sans, 18'center right; \
 	set ylabel 'packets arrived [%]'; \
 	set yrange [0:105]; \
 	set xlabel 'speedup'; \
diff --git a/tests/satellites3/plot.sh b/tests/satellites3/plot.sh
index 10e64fb..a6be6eb 100755
--- a/tests/satellites3/plot.sh
+++ b/tests/satellites3/plot.sh
@@ -9,7 +9,7 @@ gnuplot -e "
 	set term png; \
 	set terminal png size 1280,960; \
 	set output '${prefix}satellites3.png'; \
-	set key spacing 2 font 'Helvetica, 18'center right; \
+	set key spacing 2 font 'sans, 18'center right; \
 	set ylabel 'packets arrived [%]'; \
 	set yrange [0:105]; \
 	set xlabel 'real_time [sec]'; \
diff --git a/tests/scalability1/plot.sh b/tests/scalability1/plot.sh
index c32a51f..bc446aa 100755
--- a/tests/scalability1/plot.sh
+++ b/tests/scalability1/plot.sh
@@ -10,7 +10,7 @@ for id in 'line' 'grid4' 'grid8' 'rtree'; do
 		set term png; \
 		set terminal png size 1280,960; \
 		set output '${prefix}scalability1-$id.png'; \
-		set key spacing 1 font 'Helvetica, 12'; \
+		set key spacing 1 font 'sans, 12'; \
 		set xlabel '# number of nodes'; \
 		set ylabel 'tx per node [KB/s]'; \
 		set y2label 'packet arrival [%]'; \
diff --git a/tests/scalability2/plot.sh b/tests/scalability2/plot.sh
index 6e83eb1..bc8458c 100755
--- a/tests/scalability2/plot.sh
+++ b/tests/scalability2/plot.sh
@@ -10,7 +10,7 @@ for id in 'line' 'grid4' 'grid8' 'rtree'; do
 		set term png; \
 		set terminal png size 1280,960; \
 		set output '${prefix}scalability2-$id.png'; \
-		set key spacing 1 font 'Helvetica, 12'; \
+		set key spacing 1 font 'sans, 12'; \
 		set xlabel '# number of nodes'; \
 		set ylabel 'tx per node [KB/s]'; \
 		set y2label 'packet arrival [%]'; \
diff --git a/tests/scalability3/plot.sh b/tests/scalability3/plot.sh
index 10db246..21655e0 100755
--- a/tests/scalability3/plot.sh
+++ b/tests/scalability3/plot.sh
@@ -10,7 +10,7 @@ for id in 'line' 'grid4' 'grid8' 'rtree'; do
 		set term png; \
 		set terminal png size 1280,960; \
 		set output '${prefix}scalability3-$id.png'; \
-		set key spacing 1 font 'Helvetica, 12'; \
+		set key spacing 1 font 'sans, 12'; \
 		set xlabel '# number of nodes'; \
 		set ylabel 'tx per node [KB/s]'; \
 		set y2label 'packet arrival [%]'; \