diff --git a/benchmark/plot-histogram.gp b/benchmark/plot-histogram.gp
old mode 100644
new mode 100755
index 74786e8..7ffd62f
--- a/benchmark/plot-histogram.gp
+++ b/benchmark/plot-histogram.gp
@@ -1,3 +1,5 @@
+#!/usr/bin/env gnuplot
+
 set terminal png large font "arial,26" size 1920,1080
 set output 'benchmark/histogram/distribution.png'
 
diff --git a/benchmark/plot-histogram.sh b/benchmark/plot-histogram.sh
deleted file mode 100755
index 15c372c..0000000
--- a/benchmark/plot-histogram.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/sh
-
-gnuplot benchmark/plot-histogram.gp
-
diff --git a/benchmark/run.sh b/benchmark/run.sh
index 15ce13c..c46ceae 100755
--- a/benchmark/run.sh
+++ b/benchmark/run.sh
@@ -1,4 +1,4 @@
 #!/bin/sh
 
 benchmark/run-benchmark.sh && make benchmarks-slow && \
-benchmark/parse.sh && benchmark/plot-histogram.sh
+benchmark/parse.sh && benchmark/plot-histogram.gp