diff --git a/utils/NightlyTest.gnuplot b/utils/NightlyTest.gnuplot
index 69d61877b4e..ebb420e5170 100644
--- a/utils/NightlyTest.gnuplot
+++ b/utils/NightlyTest.gnuplot
@@ -18,7 +18,7 @@ set label "llvm-db\ncheckin" at "2004-01-04:", 145000
 set label "llvm/projects" at "2004-01-04:", 151000
 
 set size .75,.75
-set xtics rotate by 90
+set xtics rotate
 set xlabel 0,-1
 plot "running_loc.txt" using 1:2 title '' with lines, \
      "running_loc.txt" using 1:2 title "Date vs. Lines of Code" with lines
@@ -38,7 +38,7 @@ set nolabel
 ##------- Olden CBE performance ----
 
 set size .75,.75
-set xtics rotate by 90
+set xtics rotate
 set xlabel 0,-1
 set output "running_Olden_cbe_time.png"
 set ylabel "CBE compiled execution time (s)"
@@ -75,7 +75,7 @@ plot "running_Olden_cbe_time.txt" u 1:2 t '' with lines, \
 ##------- Olden JIT performance ----
 
 set size .75,.75
-set xtics rotate by 90
+set xtics rotate
 set xlabel 0,-1
 set output "running_Olden_jit_time.png"
 set ylabel "JIT execution time (s)"
@@ -112,7 +112,7 @@ plot "running_Olden_jit_time.txt" u 1:2 t '' with lines, \
 ##------- Olden LLC performance ----
 
 set size .75,.75
-set xtics rotate by 90
+set xtics rotate
 set xlabel 0,-1
 set output "running_Olden_llc_time.png"
 set ylabel "LLC compiled execution time (s)"
@@ -150,7 +150,7 @@ plot "running_Olden_llc_time.txt" u 1:2 t '' with lines, \
 ##------- Olden optimizer time ----
 
 set size .75,.75
-set xtics rotate by 90
+set xtics rotate
 set xlabel 0,-1
 set output "running_Olden_opt_time.png"
 set ylabel "Time to run the optimizer (s)"
@@ -188,7 +188,7 @@ plot "running_Olden_opt_time.txt" u 1:2 t '' with lines, \
 ##------- Machine code size ----
 
 set size .75,.75
-set xtics rotate by 90
+set xtics rotate
 set xlabel 0,-1
 set output "running_Olden_machcode.png"
 set ylabel "Program machine code size (bytes)"
@@ -226,7 +226,7 @@ plot "running_Olden_machcode.txt" u 1:2 t '' with lines, \
 ##------- Bytecode size ----
 
 set size .75,.75
-set xtics rotate by 90
+set xtics rotate
 set xlabel 0,-1
 set output "running_Olden_bytecode.png"
 set ylabel "Program bytecode size (bytes)"