diff --git a/pkg/perfdata/range.go b/pkg/perfdata/range.go
index 82c5df9..4e3c00d 100644
--- a/pkg/perfdata/range.go
+++ b/pkg/perfdata/range.go
@@ -70,12 +70,12 @@ func (r *Range) String() string {
 type rangeParserState int
 
 const (
-	rpsInit        = iota // Initial state
-	rpsExpectStart        // Expect the start of the range
-	rpsInStart            // Reading the start of the range
-	rpsExpectColon        // Expect the colon that separates the start and end
-	rpsExpectEnd          // Expect the end of the range
-	rpsInEnd              // Reading the end of the range
+	rpsInit        rangeParserState = iota // Initial state
+	rpsExpectStart                         // Expect the start of the range
+	rpsInStart                             // Reading the start of the range
+	rpsExpectColon                         // Expect the colon that separates the start and end
+	rpsExpectEnd                           // Expect the end of the range
+	rpsInEnd                               // Reading the end of the range
 )
 
 // An error emitted by the range parser.