diff --git a/.golangci.yml b/.golangci.yml
index 322c28f..af390b5 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -30,6 +30,7 @@ linters:
     - forbidigo
     - ifshort
     - cyclop
+    - perfsprint
     - promlinter
     - varnamelen
     - nonamedreturns
diff --git a/internal_checks.go b/internal_checks.go
index ca3696c..68dabb2 100644
--- a/internal_checks.go
+++ b/internal_checks.go
@@ -7,7 +7,7 @@ import (
 )
 
 type InternalCheck interface {
-	Check(context.Context, *bytes.Buffer, []string) int
+	Check(ctx context.Context, output *bytes.Buffer, args []string) int
 }
 
 func execInternal(result *answer, cmd *command, received *receivedStruct) {
diff --git a/internal_negate_test.go b/internal_negate_test.go
index 1d579d4..daf9b77 100644
--- a/internal_negate_test.go
+++ b/internal_negate_test.go
@@ -12,8 +12,8 @@ func TestNegate(t *testing.T) {
 
 	assert.Equal(t, Exec, cmd.ExecType, "exec type")
 	assert.NotNil(t, cmd.Negate, "parsed negate")
-	assert.Equal(t, cmd.Negate.WarningStatus, "OK", "parsed negate")
-	assert.Equal(t, cmd.Negate.CriticalStatus, "UNKNOWN", "parsed negate")
+	assert.Equal(t, "OK", cmd.Negate.WarningStatus, "parsed negate")
+	assert.Equal(t, "UNKNOWN", cmd.Negate.CriticalStatus, "parsed negate")
 }
 
 func TestExecuteCommandWithNegateI(t *testing.T) {
diff --git a/readAndExecute_test.go b/readAndExecute_test.go
index 5bc69e2..61a7492 100644
--- a/readAndExecute_test.go
+++ b/readAndExecute_test.go
@@ -284,7 +284,7 @@ func BenchmarkParseCommandI(b *testing.B) {
 	com := parseCommand(cmdLine, &config)
 	assert.Equal(b, "/bin/test", com.Command, "command parsed")
 	assert.Equalf(b, map[string]string{"VAR1": "test", "VAR2": "test"}, com.Env, "env parsed")
-	assert.Equal(b, 2, len(com.Args), "args parsed")
+	assert.Lenf(b, com.Args, 2, "args parsed")
 }
 
 func BenchmarkParseCommandII(b *testing.B) {
@@ -297,5 +297,5 @@ func BenchmarkParseCommandII(b *testing.B) {
 	com := parseCommand(cmdLine, &config)
 	assert.Equal(b, "/bin/test", com.Command, "command parsed")
 	assert.Equalf(b, map[string]string{"VAR1": "test", "VAR2": "test"}, com.Env, "env parsed")
-	assert.Equal(b, 13, len(com.Args), "args parsed")
+	assert.Lenf(b, com.Args, 13, "args parsed")
 }