diff --git a/lib/aruba/processes/in_process.rb b/lib/aruba/processes/in_process.rb
index 0260db717..f5b387dd8 100644
--- a/lib/aruba/processes/in_process.rb
+++ b/lib/aruba/processes/in_process.rb
@@ -103,7 +103,7 @@ def stderr(*)
       #
       # @param *input [Array of String]
       def write(*input)
-        @stdin.write *input
+        @stdin.write(*input)
       end
 
       # Close io
diff --git a/spec/aruba/processes/in_process_spec.rb b/spec/aruba/processes/in_process_spec.rb
index 8fb7d0902..51483f835 100644
--- a/spec/aruba/processes/in_process_spec.rb
+++ b/spec/aruba/processes/in_process_spec.rb
@@ -156,14 +156,14 @@ def run_process(&block)
     let(:main_class) { stdin_runner }
 
     it 'writes single strings to the process' do
-      process.write "World"
+      process.write 'World'
       process.start
       process.stop
       expect(process.stdout).to eq "Hello, World!\n"
     end
 
     it 'writes multiple strings to the process' do
-      process.write "Wor", "ld"
+      process.write 'Wor', 'ld'
       process.start
       process.stop
       expect(process.stdout).to eq "Hello, World!\n"
diff --git a/spec/aruba/processes/spawn_process_spec.rb b/spec/aruba/processes/spawn_process_spec.rb
index 84dbe2eca..377073e9e 100644
--- a/spec/aruba/processes/spawn_process_spec.rb
+++ b/spec/aruba/processes/spawn_process_spec.rb
@@ -58,7 +58,7 @@
 
     it 'writes multiple strings to the process' do
       process.start
-      process.write "hel", "lo\n"
+      process.write 'hel', "lo\n"
       process.stop
 
       expect(process.stdout).to eq "hello\n"